US20090203300A1 - Carrier for holding an object to be polished - Google Patents
Carrier for holding an object to be polished Download PDFInfo
- Publication number
- US20090203300A1 US20090203300A1 US12/386,139 US38613909A US2009203300A1 US 20090203300 A1 US20090203300 A1 US 20090203300A1 US 38613909 A US38613909 A US 38613909A US 2009203300 A1 US2009203300 A1 US 2009203300A1
- Authority
- US
- United States
- Prior art keywords
- carrier
- holding
- workpiece
- substrate
- dlc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005498 polishing Methods 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 9
- 238000005268 plasma chemical vapour deposition Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 24
- 229910001385 heavy metal Inorganic materials 0.000 description 20
- 238000011109 contamination Methods 0.000 description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 16
- 229910052710 silicon Inorganic materials 0.000 description 16
- 239000010703 silicon Substances 0.000 description 16
- 239000000969 carrier Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 9
- 239000004744 fabric Substances 0.000 description 9
- 229910003460 diamond Inorganic materials 0.000 description 8
- 239000010432 diamond Substances 0.000 description 8
- 239000010408 film Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 5
- 229920002978 Vinylon Polymers 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 229910052755 nonmetal Inorganic materials 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000012050 conventional carrier Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
- A61B5/441—Skin evaluation, e.g. for skin disorder diagnosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H23/00—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms
- A61H23/02—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with electric or magnetic drive
- A61H23/0218—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with electric or magnetic drive with alternating magnetic fields producing a translating or oscillating movement
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/007—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating
- A61F2007/0075—Heating or cooling appliances for medical or therapeutic treatment of the human body characterised by electric heating using a Peltier element, e.g. near the spot to be heated or cooled
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0086—Heating or cooling appliances for medical or therapeutic treatment of the human body with a thermostat
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0095—Heating or cooling appliances for medical or therapeutic treatment of the human body with a temperature indicator
- A61F2007/0096—Heating or cooling appliances for medical or therapeutic treatment of the human body with a temperature indicator with a thermometer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/01—Constructive details
- A61H2201/0157—Constructive details portable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/10—Characteristics of apparatus not provided for in the preceding codes with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy
- A61H2201/105—Characteristics of apparatus not provided for in the preceding codes with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy with means for delivering media, e.g. drugs or cosmetics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/16—Physical interface with patient
- A61H2201/1683—Surface of interface
- A61H2201/1685—Surface of interface interchangeable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
- A61H2201/5007—Control means thereof computer controlled
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
- A61H2201/5023—Interfaces to the user
- A61H2201/5043—Displays
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
- A61H2201/5058—Sensors or detectors
- A61H2201/5082—Temperature sensors
Definitions
- the present invention relates to a carrier for holding a workpiece which is used in a double-sided polishing apparatus that simultaneously polishes both surfaces of the workpiece by holding the workpiece between upper and lower platens covered with abrasive cloth with the platens and the workpiece being in pressure contact with each other, and rotating at least one of the platens and the workpiece, the surface of the carrier being coated with diamond-like carbon, and to a method of manufacturing the carrier, and a method of polishing a workpiece using the carrier.
- the invention relates to a diamond-like carbon coated carrier for holding a workpiece used for polishing both surfaces of a silicon wafer, a method of manufacturing the carrier, and a polishing method using the carrier.
- the workpiece In polishing a silicon wafer, a compound semiconductor wafer, an aluminum-made magnetic disk substrate, a glass-made magnetic disk substrate, or a workpiece that is made of photomask glass, a crystal oscillator, metal, or the like, the workpiece is held by a carrier cut into a shape where a holding hole is formed in conformity to a shape of the workpiece and peripheral (outer) gear teeth are arranged at an outer edge so as to mesh with an internal gear and sun gear of a double-sided polishing machine.
- the workpiece is driven together with the carrier.
- the carrier is mainly used as a member of a polishing apparatus for lapping or polishing both surfaces of a silicon wafer, a magnetic disk substrate, or the like at a time. Hence, the thickness of the carrier member is set slightly smaller than that of the workpiece such as a wafer.
- glass cloth woven out of a metal material such as steel or stainless steel and glass fibers, or organic fiber cloth is impregnated with an epoxy resin, a phenol resin, or other such thermosetting resins. Then, several cloths are stacked into a desired thickness, pressed with a pressing machine, and cured with heat.
- the resultant material for example, a so-called FRP is used as a raw material and cut into a size sufficient to hold the workpiece in accordance with the intended use. In addition, its peripheral portion is cut in conformity with a gear shape.
- the thickness is adjusted by lapping or grinding, and the wafer is etched with an acid or alkali etchant, followed by polishing to attain a mirror-finished surface on one or both of the front and rear sides of the wafer.
- some workpieces which include the silicon wafer, undergo double-sided polishing, in which the polishing was hitherto performed on only one side.
- An indispensable condition for double-sided polishing is to use a carrier for holding a workpiece. In this case, what is important are an abrasion resistance and durability of a carrier itself, and whether or not a heavy metal in the carrier causes any contamination.
- a carrier made of, for example, a hard resin or a nonmetal material such as FRP is inferior in abrasion resistance and durability, and thus falls short of practical applicability.
- a carrier made of a metal material such as steel or stainless steel has a problem of heavy metal contamination.
- the substrate surface is coated with any material.
- a ceramic-coated metal carrier as disclosed in JP 04-026177 A.
- JP 2002-018707 A discloses an SK steel-made carrier whose surface is plated with metal. This offers by no means a solution to the problem in that the workpiece is contaminated with heavy metal, in particular, in polishing the semiconductor wafer.
- JP 11-010530 A discloses a carrier given a dressing function, which is prepared by welding the ceramic particles to uneven upper and lower surfaces and in addition, coating the uneven surfaces with diamond-like carbon.
- the document describes that the durability and the abrasion resistance are improved by the effect of the diamond-like carbon.
- the carrier is devised for the purpose of preventing the ceramic particles functioning to dress the target from coming off from the surface, and thus differs from the carrier for holding the workpiece which is used for double-sided polishing.
- the inventors of the present invention have made extensive studies with an aim to solve the problems regarding the durability, abrasion resistance, and heavy metal contamination in polishing both surfaces of a semiconductor material such as a silicon wafer. As a result, the inventors presupposed that the above-mentioned problems may be solved by coating an ordinary carrier with diamond-like carbon on its surface with a high surface smoothness, and have worked on its development and research.
- DLC diamond-like carbon
- SP 3 bond diamond structure
- SP bond graphite structure
- the inventors of the present invention have found, as a result of extensive studies on the problem inherent in the aforementioned conventional double-sided polishing carrier, all or part of the carrier surface is coated with a uniform DLC thin film having a highly smooth surface, whereby it is possible to remarkably improve the abrasion resistance and durability of the carrier, to prevent heavy metals from eluting from the carrier to cause contamination, and to protect the surface to be polished against any scratches resulting from a coating material coming off from the carrier surface.
- a polishing apparatus in which the carrier of the present invention is used, is a so-called double-sided polishing apparatus for polishing both surfaces of the workpiece at a time by holding the workpiece between upper and lower platens covered with an abrasive cloth, the platens and the workpiece being in pressure contact with each other, and rotating at least one of the upper and lower platens and the workpiece.
- a manufacturing method for a DLC-coated carrier for holding a workpiece relates to a manufacturing method for a carrier holding a workpiece, including: providing a surface coating apparatus using a plasma CVD method in which an anode electrode and a cathode electrode are arranged face to face in a vacuum chamber, a carrier substrate is interposed between the anode electrode and the cathode electrode, and RF power is applied between the anode electrode and the cathode electrode while supplying a material gas to form a diamond-like carbon film on the substrate surface; interposing a substrate between the anode electrode and the cathode electrode; and shifting a supporting position of the substrate during formation of the diamond-like carbon film or between current formation and next formation.
- a so-called plasma CVD method is used, and the supporting position of the substrate is shifted as appropriate to thereby leave substantially no uncoated area.
- the still other object of the present invention is attained by a polishing method for polishing both surfaces of a workpiece, including: mounting a carrier for holding a workpiece according to the present invention, between upper and lower platens covered with abrasive cloth; holding the workpiece in a holding hole in the carrier for holding the workpiece; rotating at least one of the upper and lower platens and the workpiece while supplying an abrasive slurry to a surface to be processed to polish both surfaces of the workpiece, wherein the abrasive cloth is made of one selected from the group consisting of sueded synthetic leather, polyurethane, and a composite prepared by binding non-woven cloth with polyurethane.
- the carrier of the present invention overcomes all the problems inherent in the conventional carrier.
- a carrier is shaped into a disk-like thin plate, and has a peripheral gear at its outermost edge and a holding hole for holding a workpiece in its inner position, and optionally a lightening hole.
- the carrier size varies depending on the apparatus model but ranges from several centimeters to several ten centimeters; some carriers exceed 1 m in size by the model.
- a carrier somewhat thinner than the polishing object is used.
- a silicon wafer has a thickness of about several hundred micrometers. Accordingly, the entire surface of a carrier substrate corresponds to the front and rear surfaces and a side surface (section along its thickness direction).
- an area to be coated with DLC includes the side surface.
- the carrier is thin in section along its thickness direction, and besides, meshes with an internal gear and sun gear of an apparatus or contacts the workpiece at the side surface portion.
- a portion is most likely to receive a local stress and a large frictional force, and thus is more fragile than other portions. Even if not cracked, this portion will cause minute cracks and heavy metal contamination resulting from wear.
- a workpiece is held between upper and lower platens covered with abrasive cloth and polished while spraying an abrasive such as colloidal silica slurry.
- an abrasive such as colloidal silica slurry.
- a material of a substrate used for a carrier is not particular limited but is preferably any of steel, stainless steel, aluminum, an aluminum alloy, a resin, a fiber-reinforced resin, and a composite thereof.
- a metal material such as steel, stainless steel, or an aluminum alloy as the material of the substrate.
- a feature of the DLC resides in its structure in which a diamond structure (SP 3 bond) and a graphite structure (SP 2 bond) coexist, and which has a hardness of 1,000 to 4,000 kgf/mm 2 in terms of Vickers hardness, that is, a high hardness comparable with superhard ceramics or diamond.
- the DLC is amorphous, not microcrystalline, unlike diamond or superhard ceramics, and thus is featured by its ability to form a uniform and highly smooth surface.
- a feature of the DLC resides in a high hardness equivalent to diamond as well as a high surface smoothness and low friction coefficient, unlike diamond, in short, its extremely high sliding property. Accordingly, a feature of the carrier for holding a workpiece whose entire surface is coated with the DLC according to the present invention resides in less wear and damage in a sliding portion, and still less wear of the surface.
- the entire surface of the carrier of the present invention is coated with the DLC as a nonmetal material, so even with a substrate made of a metal, for example, steel, the carrier is free from elution due to a chemical reaction with an acid or alkali in the abrasive composition, which enables protection against heavy metal contamination.
- the carrier for holding the workpiece As a manufacturing method for the carrier for holding the workpiece according to the present invention, plasma CVD is employed as discussed above. With this method, the entire structure is exposed to the plasma, making it possible to cover the entire surface with the uniform and dense DLC coating film.
- the DLC coating film thickness can be controlled based on coating conditions and time.
- the carrier of the present invention is relatively large when taking into account a material size treatable with conventional plasma CVD methods. It is necessary to support the carrier with any holding jig during the treatment, so the supported portion is not exposed to the plasma during the treatment. As a result, part of the substrate surface remains untreated. Accordingly, a supporting position is shifted as appropriate, which leaves substantially no uncoated area, and the substantially uniform DLC thin film with the uniform thickness can be formed.
- the substrate thickness uniform in advance of the DLC coating on the substrate surface. If the substrate thickness is not uniform, the wear proceeds concentratedly in the thick portion and a coating on this portion peels off.
- a relative standard deviation of the thickness is preferably 0.4% or less, more preferably 0.2% or less.
- lapping, cutting, or polishing may be adopted without any particular limitations; alternatively, those may be carried out in turn stepwise.
- the DLC coating film thickness preferably ranges from 0.1 ⁇ m to 20 ⁇ m. With the thickness smaller than 0.1 ⁇ m, its frictional strength is a little inferior, while the thickness exceeding 20 ⁇ m requires too much time to form the film and is disadvantageous in terms of cost performance. Also, for the purpose of protecting end surfaces of the workpiece during processing, a resin may be applied to surround the holding hole for holding the workpiece in the DLC coated carrier.
- a polishing apparatus and conditions used in the examples of the present invention and comparative examples are summarized in Tables 1 and 3 below.
- As the polishing apparatus a double-sided polishing apparatus (DSM-9B, available from SPEEDFAM Co., Ltd.) was used.
- As the abrasive cloth As the abrasive cloth, SUBA 800 (available from Rodel Co., Ltd.) was used.
- An abrasive, Rodel 12371 (available from Rodel Co., Ltd.) was prepared by adding 10 parts of pure water per part of concentrate solution.
- An SUS-made carrier substrate which had been lapped into the thickness of 550 ⁇ m in advance, was coated with DLC of a thickness of 2.5 ⁇ m. After the substrate was coated with the DLC up to 1.0 ⁇ m under the film formation temperature set to 150° C., the supporting position was shifted to resume the deposition by 1.5 ⁇ m.
- the resultant DLC coated carrier was polished under the conditions of Table 1 without holding the workpiece.
- the diluted abrasive was recycled.
- a wear rate was determined by calculating a difference between the thicknesses measured before and after the polishing with a micrometer. The durability was examined based on a visual test.
- a carrier As a carrier, three types of carriers of an SUS-made carrier, a glass epoxy-resin-made (EG-made) carrier, and an FR-vinylon-made resin were used, none of which were coated with the DLC.
- Example 1 The three types of carriers all had the thickness of about 550 ⁇ m.
- the carriers were polished under the conditions of Table 1 without holding a workpiece as in Example 1.
- the diluted abrasive was recycled. Polishing test results of Example 1 and Comparative Examples 1 to 3 are listed in Table 2 below.
- Example 2 The DLC coated carrier produced in Example 1 was polished under the conditions of Table 3 with the carrier holding a 6-inch silicon wafer as a workpiece. In Example 2, the diluted abrasive was not recycled.
- Comparative Examples 1 to 3 The three types of carriers used in Comparative Examples 1 to 3, that is, the SUS-made carrier, the glass-epoxy-resin-made (EG-made) carrier, and the FR-vinylon-made carrier were employed. Similar to Example 2, the carriers were polished under the conditions of Table 3, with the carriers holding the 6-inch silicon wafer. In Comparative Examples 1 to 3, the diluted abrasive was not recycled. Polishing test results of Example 2 and Comparative Examples 4 to 6 are listed in Table 4 below.
- Example 1 Example 2
- Example 3 DLC* 1 SUS EG* 2 FR-vinylon Fe 5 or lower 45 5 or lower 5 or lower Cu 5 or lower 8 5 or lower 5 or lower Cr 5 or lower 13 5 or lower 5 or lower
- Example 1 As a result of comparing Example 1 with Comparative Examples 1 to 3, the wear rate is remarkably low in Example 1, and the carrier made of FR-vinylon (Comparative Example 3) prepared by binding glass fibers with vinylon shows the next lower wear rate.
- FR-vinylon Comparative Example 3
- a visual test was carried out to examine how far cracks occur in each carrier. As a result, the carrier of Example 1 subjected to the visual test over 10 hours showed no change.
- the carriers of Comparative Examples 1 and 2 subjected to the same test over 1 hour showed no change, but cracks occurred at the base of gear teeth of the carrier of Comparative Example 3.
- Example 2 The silicon wafer surface polished in Example 2 and Comparative Examples 4 to 6 was rinsed with pure water, after which a mixture of nitric acid and hydrofluoric acid was used to dissolve the surface portion of the silicon wafer. Then, heavy metal in the solution was subjected to quantitative analysis with an ICP mass spectroscope to measure a contamination level of the silicon wafer surface with iron, copper, and chromium.
- the carrier of Example 2 and carriers made of a nonmetal material involved less contamination with a heavy metal.
- the carrier produced by coating the metal substrate with DLC is comparable with nonmetal carriers in terms of the contamination with heavy metal.
- Comparative Example 1 As has been described so far, in Comparative Example 1, the wear rate is high and contamination with a heavy metal is observed. In Comparative Example 2, the durability and contamination with a heavy metal fall within an allowable range, while the wear rate is high. In Comparative Example 3, the durability and contamination with a heavy metal fall within an allowable range, while the cracks occur at the base of gear teeth during the test over 1 hour. This reveals that its durability is far from practical.
- the DLC coated carrier of the present invention as explained in Examples 1 and 2 excels in every item: wear resistance, durability, and heavy metal contamination.
- the use of the DLC coated carrier according to the present invention can improve the durability and wear resistance of the carrier as expendables and significantly prolong the carrier's service life, so the carrier produces beneficial effects from the economical and qualitative points of view.
- the metal surface is coated throughout, whereby even in polishing, heavy metal neither elutes nor spatters, which is highly advantageous for polishing a workpiece such as a silicon wafer which is extremely weak against contamination with heavy metal and actually producing the same.
Abstract
The present invention provides a diamond-like carbon coated carrier for holding an object to be polished used for double-sided polishing, and a manufacturing method therefor. The carrier for holding a workpiece according to the present invention has a substrate whose entire surface is coated with diamond-like carbon. The method of the present invention includes coating the entire carrier surface with diamond-like carbon using a surface coating apparatus using plasma CVD.
Description
- This is a continuation of Ser. No. 11/074,481, filed Mar. 8, 2005, which corresponds to Japanese Application No. 2004-066013, filed Mar. 9, 2004.
- 1. Field of the Invention
- The present invention relates to a carrier for holding a workpiece which is used in a double-sided polishing apparatus that simultaneously polishes both surfaces of the workpiece by holding the workpiece between upper and lower platens covered with abrasive cloth with the platens and the workpiece being in pressure contact with each other, and rotating at least one of the platens and the workpiece, the surface of the carrier being coated with diamond-like carbon, and to a method of manufacturing the carrier, and a method of polishing a workpiece using the carrier. In particular, the invention relates to a diamond-like carbon coated carrier for holding a workpiece used for polishing both surfaces of a silicon wafer, a method of manufacturing the carrier, and a polishing method using the carrier.
- 2. Description of the Related Art
- In polishing a silicon wafer, a compound semiconductor wafer, an aluminum-made magnetic disk substrate, a glass-made magnetic disk substrate, or a workpiece that is made of photomask glass, a crystal oscillator, metal, or the like, the workpiece is held by a carrier cut into a shape where a holding hole is formed in conformity to a shape of the workpiece and peripheral (outer) gear teeth are arranged at an outer edge so as to mesh with an internal gear and sun gear of a double-sided polishing machine. The workpiece is driven together with the carrier. The carrier is mainly used as a member of a polishing apparatus for lapping or polishing both surfaces of a silicon wafer, a magnetic disk substrate, or the like at a time. Hence, the thickness of the carrier member is set slightly smaller than that of the workpiece such as a wafer.
- Up to now, the following method has been generally used for producing such carriers. That is, glass cloth woven out of a metal material such as steel or stainless steel and glass fibers, or organic fiber cloth is impregnated with an epoxy resin, a phenol resin, or other such thermosetting resins. Then, several cloths are stacked into a desired thickness, pressed with a pressing machine, and cured with heat. The resultant material, for example, a so-called FRP is used as a raw material and cut into a size sufficient to hold the workpiece in accordance with the intended use. In addition, its peripheral portion is cut in conformity with a gear shape.
- Those carriers are rotated together with a silicon wafer, a magnetic disk substrate, etc. in the polishing apparatus, and forcedly driven by an internal gear and a sun gear through its peripheral gear teeth. Hence, the surface is polished to some degree to lower its strength or accuracy of form, resulting in a reduction in durability over time. Also, a gear portion is worn to cause the carrier to come off from the polishing apparatus or to destabilize polishing conditions. This requires replacement with new carriers each time or periodically. Accordingly, there is an increasing demand for development of carriers having a high durability that secures as long a service life as possible. To meet such a demand, there is proposed an FRP-based carrier as disclosed in JP 2001-038609 A, for example. Furthermore, as the purity of a silicon wafer is increased, there has arisen a problem of contamination of the wafer with a trace amount of heavy metals eluting from a metal-made carrier, albeit being a negligible amount in a conventional technique.
- In the conventional technique, regarding the silicon wafer or compound wafer, the thickness is adjusted by lapping or grinding, and the wafer is etched with an acid or alkali etchant, followed by polishing to attain a mirror-finished surface on one or both of the front and rear sides of the wafer. With a view to increasing the surface accuracy or preventing house dust contamination, some workpieces, which include the silicon wafer, undergo double-sided polishing, in which the polishing was hitherto performed on only one side. To that end, a demand for double-sided polishing is growing. An indispensable condition for double-sided polishing is to use a carrier for holding a workpiece. In this case, what is important are an abrasion resistance and durability of a carrier itself, and whether or not a heavy metal in the carrier causes any contamination.
- A carrier made of, for example, a hard resin or a nonmetal material such as FRP is inferior in abrasion resistance and durability, and thus falls short of practical applicability. Meanwhile, a carrier made of a metal material such as steel or stainless steel has a problem of heavy metal contamination. Hence, there is a growing demand for the development of carriers that will overcome all the above problems.
- As one possible method of preventing heavy metal contamination on the assumption that a metal material having superior abrasion resistance and durability is used as a substrate, the substrate surface is coated with any material. As an example thereof, there is proposed a ceramic-coated metal carrier as disclosed in JP 04-026177 A. Although exhibiting an extremely high performance regarding abrasion resistance, the carrier has a problem in that ceramic particles adhering to the surface drop out of the surface, and the workpiece is scratched thereby. Also, JP 2002-018707 A discloses an SK steel-made carrier whose surface is plated with metal. This offers by no means a solution to the problem in that the workpiece is contaminated with heavy metal, in particular, in polishing the semiconductor wafer. Further, JP 11-010530 A discloses a carrier given a dressing function, which is prepared by welding the ceramic particles to uneven upper and lower surfaces and in addition, coating the uneven surfaces with diamond-like carbon. The document describes that the durability and the abrasion resistance are improved by the effect of the diamond-like carbon. The carrier is devised for the purpose of preventing the ceramic particles functioning to dress the target from coming off from the surface, and thus differs from the carrier for holding the workpiece which is used for double-sided polishing.
- The inventors of the present invention have made extensive studies with an aim to solve the problems regarding the durability, abrasion resistance, and heavy metal contamination in polishing both surfaces of a semiconductor material such as a silicon wafer. As a result, the inventors presupposed that the above-mentioned problems may be solved by coating an ordinary carrier with diamond-like carbon on its surface with a high surface smoothness, and have worked on its development and research. As has been known in the art, a feature of the diamond-like carbon (hereinafter, referred to as “DLC”) resides in its structure, albeit an amorphous carbon structure, in which a diamond structure (SP3 bond) and a graphite structure (SP bond) coexist, and which has as a high hardness as diamond, and attains a high surface smoothness and low friction coefficient unlike diamond. The DLC can be easily formed into a thin film by plasma CVD etc. as disclosed in JP 10-046344 A. The inventors of the present invention have concluded that a carrier produced by uniformly and firmly laminating the DLC thin film having the above-described performance thereon and a manufacturing method therefor would solve the above-mentioned problems.
- The inventors of the present invention have found, as a result of extensive studies on the problem inherent in the aforementioned conventional double-sided polishing carrier, all or part of the carrier surface is coated with a uniform DLC thin film having a highly smooth surface, whereby it is possible to remarkably improve the abrasion resistance and durability of the carrier, to prevent heavy metals from eluting from the carrier to cause contamination, and to protect the surface to be polished against any scratches resulting from a coating material coming off from the carrier surface.
- It is therefore an object of the present invention to provide a carrier having a high durability and abrasion resistance and causing as few scratches on a workpiece and as little heavy metal contamination as possible. Another object of the present invention is to provide a manufacturing method for the carrier. Still another object of the present invention is to provide a double-sided polishing method using the carrier.
- The aforementioned objects can be attained by a carrier for holding a workpiece, the carrier including a substrate whose entire surface is coated with DLC. A polishing apparatus, in which the carrier of the present invention is used, is a so-called double-sided polishing apparatus for polishing both surfaces of the workpiece at a time by holding the workpiece between upper and lower platens covered with an abrasive cloth, the platens and the workpiece being in pressure contact with each other, and rotating at least one of the upper and lower platens and the workpiece.
- Further, according to the other object of the present invention, a manufacturing method for a DLC-coated carrier for holding a workpiece relates to a manufacturing method for a carrier holding a workpiece, including: providing a surface coating apparatus using a plasma CVD method in which an anode electrode and a cathode electrode are arranged face to face in a vacuum chamber, a carrier substrate is interposed between the anode electrode and the cathode electrode, and RF power is applied between the anode electrode and the cathode electrode while supplying a material gas to form a diamond-like carbon film on the substrate surface; interposing a substrate between the anode electrode and the cathode electrode; and shifting a supporting position of the substrate during formation of the diamond-like carbon film or between current formation and next formation. In other words, in the manufacturing method, a so-called plasma CVD method is used, and the supporting position of the substrate is shifted as appropriate to thereby leave substantially no uncoated area.
- The still other object of the present invention is attained by a polishing method for polishing both surfaces of a workpiece, including: mounting a carrier for holding a workpiece according to the present invention, between upper and lower platens covered with abrasive cloth; holding the workpiece in a holding hole in the carrier for holding the workpiece; rotating at least one of the upper and lower platens and the workpiece while supplying an abrasive slurry to a surface to be processed to polish both surfaces of the workpiece, wherein the abrasive cloth is made of one selected from the group consisting of sueded synthetic leather, polyurethane, and a composite prepared by binding non-woven cloth with polyurethane.
- According to the present invention, it is possible to provide a carrier for holding a workpiece with ease, which is superior in durability and abrasion resistance and free of heavy metal contamination. In other words, the carrier of the present invention overcomes all the problems inherent in the conventional carrier.
- Hereinafter, an embodiment of the present invention will be described. In the present invention, a carrier is shaped into a disk-like thin plate, and has a peripheral gear at its outermost edge and a holding hole for holding a workpiece in its inner position, and optionally a lightening hole. The carrier size varies depending on the apparatus model but ranges from several centimeters to several ten centimeters; some carriers exceed 1 m in size by the model. A carrier somewhat thinner than the polishing object is used. For example, a silicon wafer has a thickness of about several hundred micrometers. Accordingly, the entire surface of a carrier substrate corresponds to the front and rear surfaces and a side surface (section along its thickness direction). In the present invention, an area to be coated with DLC includes the side surface. In particular, the carrier is thin in section along its thickness direction, and besides, meshes with an internal gear and sun gear of an apparatus or contacts the workpiece at the side surface portion. Hence, such a portion is most likely to receive a local stress and a large frictional force, and thus is more fragile than other portions. Even if not cracked, this portion will cause minute cracks and heavy metal contamination resulting from wear. Upon polishing, a workpiece is held between upper and lower platens covered with abrasive cloth and polished while spraying an abrasive such as colloidal silica slurry. As a result, although the front and rear surfaces of the carrier are not directly applied with pressure, they are polished to a slight extent, leading to wear and considerable reduction in durability.
- In the present invention, a material of a substrate used for a carrier is not particular limited but is preferably any of steel, stainless steel, aluminum, an aluminum alloy, a resin, a fiber-reinforced resin, and a composite thereof. In particular, in polishing a silicon wafer of 300 mm in diameter, it is preferable to use a metal material such as steel, stainless steel, or an aluminum alloy as the material of the substrate.
- In the present invention, it is indispensable to completely cover the front and rear surfaces and side surface (section along the thickness direction) of the carrier with a DLC thin film. As mentioned above, a feature of the DLC resides in its structure in which a diamond structure (SP3 bond) and a graphite structure (SP2 bond) coexist, and which has a hardness of 1,000 to 4,000 kgf/mm2 in terms of Vickers hardness, that is, a high hardness comparable with superhard ceramics or diamond. Meanwhile, the DLC is amorphous, not microcrystalline, unlike diamond or superhard ceramics, and thus is featured by its ability to form a uniform and highly smooth surface. To elaborate, a feature of the DLC resides in a high hardness equivalent to diamond as well as a high surface smoothness and low friction coefficient, unlike diamond, in short, its extremely high sliding property. Accordingly, a feature of the carrier for holding a workpiece whose entire surface is coated with the DLC according to the present invention resides in less wear and damage in a sliding portion, and still less wear of the surface. In addition, the entire surface of the carrier of the present invention is coated with the DLC as a nonmetal material, so even with a substrate made of a metal, for example, steel, the carrier is free from elution due to a chemical reaction with an acid or alkali in the abrasive composition, which enables protection against heavy metal contamination.
- As a manufacturing method for the carrier for holding the workpiece according to the present invention, plasma CVD is employed as discussed above. With this method, the entire structure is exposed to the plasma, making it possible to cover the entire surface with the uniform and dense DLC coating film. The DLC coating film thickness can be controlled based on coating conditions and time. The carrier of the present invention is relatively large when taking into account a material size treatable with conventional plasma CVD methods. It is necessary to support the carrier with any holding jig during the treatment, so the supported portion is not exposed to the plasma during the treatment. As a result, part of the substrate surface remains untreated. Accordingly, a supporting position is shifted as appropriate, which leaves substantially no uncoated area, and the substantially uniform DLC thin film with the uniform thickness can be formed.
- In manufacturing the carrier for holding the workpiece of the present invention, it is preferable to make the substrate thickness uniform in advance of the DLC coating on the substrate surface. If the substrate thickness is not uniform, the wear proceeds concentratedly in the thick portion and a coating on this portion peels off. A relative standard deviation of the thickness is preferably 0.4% or less, more preferably 0.2% or less. As a method of uniformizing the substrate thickness, lapping, cutting, or polishing may be adopted without any particular limitations; alternatively, those may be carried out in turn stepwise.
- In the present invention, the DLC coating film thickness preferably ranges from 0.1 μm to 20 μm. With the thickness smaller than 0.1 μm, its frictional strength is a little inferior, while the thickness exceeding 20 μm requires too much time to form the film and is disadvantageous in terms of cost performance. Also, for the purpose of protecting end surfaces of the workpiece during processing, a resin may be applied to surround the holding hole for holding the workpiece in the DLC coated carrier.
- Hereinafter, the method of the present invention will be described in more detail based on examples and comparative examples, but the present invention is not limited by those examples. A polishing apparatus and conditions used in the examples of the present invention and comparative examples are summarized in Tables 1 and 3 below. As the polishing apparatus, a double-sided polishing apparatus (DSM-9B, available from SPEEDFAM Co., Ltd.) was used. As the abrasive cloth, SUBA 800 (available from Rodel Co., Ltd.) was used. An abrasive, Rodel 12371 (available from Rodel Co., Ltd.) was prepared by adding 10 parts of pure water per part of concentrate solution.
- An SUS-made carrier substrate, which had been lapped into the thickness of 550 μm in advance, was coated with DLC of a thickness of 2.5 μm. After the substrate was coated with the DLC up to 1.0 μm under the film formation temperature set to 150° C., the supporting position was shifted to resume the deposition by 1.5 μm.
- (Wear Test and Durability Test)
- The resultant DLC coated carrier was polished under the conditions of Table 1 without holding the workpiece. The diluted abrasive was recycled. A wear rate was determined by calculating a difference between the thicknesses measured before and after the polishing with a micrometer. The durability was examined based on a visual test.
- As a carrier, three types of carriers of an SUS-made carrier, a glass epoxy-resin-made (EG-made) carrier, and an FR-vinylon-made resin were used, none of which were coated with the DLC.
- The three types of carriers all had the thickness of about 550 μm. The carriers were polished under the conditions of Table 1 without holding a workpiece as in Example 1. The diluted abrasive was recycled. Polishing test results of Example 1 and Comparative Examples 1 to 3 are listed in Table 2 below.
-
TABLE 1 item processing time processing condition DSM - 9B platen rotational speed 100 rpm contact pressure 70 g/cm2 PAD suba 800 slurry Rodel 2371 processing time DLC: 10 hours others: 1 hour -
TABLE 2 Comparative mate- Example Comparative Comparative Example 3 rial 1 Example 1 Example 2 FR- item unit DLC*1 SUS EG*2 vinylon wear rate μm/hr <0.1 4.2 4.7 0.9 visual — ◯ ◯ ◯ X*3 test *1The SUS-made carrier surface is coated with DLC with a thickness of 2.5 μm. *2glass epoxy resin *3Cracks occur at the base of gear teeth. -
TABLE 3 item processing condition processing condition DSM - 9B platen rotational speed 100 rpm contact pressure 70 g/cm2 PAD suba 800 - The DLC coated carrier produced in Example 1 was polished under the conditions of Table 3 with the carrier holding a 6-inch silicon wafer as a workpiece. In Example 2, the diluted abrasive was not recycled.
- The three types of carriers used in Comparative Examples 1 to 3, that is, the SUS-made carrier, the glass-epoxy-resin-made (EG-made) carrier, and the FR-vinylon-made carrier were employed. Similar to Example 2, the carriers were polished under the conditions of Table 3, with the carriers holding the 6-inch silicon wafer. In Comparative Examples 1 to 3, the diluted abrasive was not recycled. Polishing test results of Example 2 and Comparative Examples 4 to 6 are listed in Table 4 below.
-
TABLE 4 Comparative Comparative Comparative item Example 1 Example 1 Example 2 Example 3 DLC*1 SUS EG*2 FR-vinylon Fe 5 or lower 45 5 or lower 5 or lower Cu 5 or lower 8 5 or lower 5 or lower Cr 5 or lower 13 5 or lower 5 or lower - As a result of comparing Example 1 with Comparative Examples 1 to 3, the wear rate is remarkably low in Example 1, and the carrier made of FR-vinylon (Comparative Example 3) prepared by binding glass fibers with vinylon shows the next lower wear rate. After the test, a visual test was carried out to examine how far cracks occur in each carrier. As a result, the carrier of Example 1 subjected to the visual test over 10 hours showed no change. The carriers of Comparative Examples 1 and 2 subjected to the same test over 1 hour showed no change, but cracks occurred at the base of gear teeth of the carrier of Comparative Example 3.
- The silicon wafer surface polished in Example 2 and Comparative Examples 4 to 6 was rinsed with pure water, after which a mixture of nitric acid and hydrofluoric acid was used to dissolve the surface portion of the silicon wafer. Then, heavy metal in the solution was subjected to quantitative analysis with an ICP mass spectroscope to measure a contamination level of the silicon wafer surface with iron, copper, and chromium. As apparent from the results shown in Table 4, the carrier of Example 2 and carriers made of a nonmetal material involved less contamination with a heavy metal. In other words, the carrier produced by coating the metal substrate with DLC is comparable with nonmetal carriers in terms of the contamination with heavy metal.
- As has been described so far, in Comparative Example 1, the wear rate is high and contamination with a heavy metal is observed. In Comparative Example 2, the durability and contamination with a heavy metal fall within an allowable range, while the wear rate is high. In Comparative Example 3, the durability and contamination with a heavy metal fall within an allowable range, while the cracks occur at the base of gear teeth during the test over 1 hour. This reveals that its durability is far from practical.
- The DLC coated carrier of the present invention as explained in Examples 1 and 2 excels in every item: wear resistance, durability, and heavy metal contamination.
- As mentioned above, the use of the DLC coated carrier according to the present invention can improve the durability and wear resistance of the carrier as expendables and significantly prolong the carrier's service life, so the carrier produces beneficial effects from the economical and qualitative points of view. Furthermore, the metal surface is coated throughout, whereby even in polishing, heavy metal neither elutes nor spatters, which is highly advantageous for polishing a workpiece such as a silicon wafer which is extremely weak against contamination with heavy metal and actually producing the same.
Claims (5)
1. A carrier for holding an object to be polished, used for a double-sided polishing apparatus, comprising a substrate which has been subjected to lapping and/or polishing to provide the substrate with a uniform thickness and then coating the entire surface of the substrate with diamond-like carbon.
2. The carrier for holding an object to be polished used for a double-sided polishing apparatus of claim 1 , wherein the relative standard deviation of the substrate thickness is no more than 0.4%.
3. The carrier for holding an object to be polished used for a double-sided polishing apparatus of claim 1 , wherein the diamond-like carbon is formed into a film having a thickness of from 0.10 μm to 20 μm.
4. The carrier for holding an object to be polished used for a double-sided polishing apparatus of claim 1 , wherein the substrate is made of a material selected from the group consisting of stainless steel, steel, aluminum, an aluminum alloy, a resin, a fiber-reinforced resin, and a composite thereof.
5. The carrier for holding an object to be polished used for a double-sided polishing apparatus of claim 1 , wherein the carrier has a holding hole for holding the object and resinous portion surrounding the holding hole.
Priority Applications (1)
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US12/386,139 US20090203300A1 (en) | 2004-03-09 | 2009-04-14 | Carrier for holding an object to be polished |
Applications Claiming Priority (4)
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JP2004066013A JP4113509B2 (en) | 2004-03-09 | 2004-03-09 | Carrier for holding an object to be polished |
JP2004-066013 | 2004-03-09 | ||
US11/074,481 US20050202758A1 (en) | 2004-03-09 | 2005-03-08 | Carrier for holding an object to be polished |
US12/386,139 US20090203300A1 (en) | 2004-03-09 | 2009-04-14 | Carrier for holding an object to be polished |
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US11/074,481 Continuation US20050202758A1 (en) | 2004-03-09 | 2005-03-08 | Carrier for holding an object to be polished |
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US12/386,139 Abandoned US20090203300A1 (en) | 2004-03-09 | 2009-04-14 | Carrier for holding an object to be polished |
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EP (1) | EP1574289B2 (en) |
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2005
- 2005-03-04 EP EP05004803.2A patent/EP1574289B2/en active Active
- 2005-03-08 US US11/074,481 patent/US20050202758A1/en not_active Abandoned
- 2005-03-08 KR KR1020050018955A patent/KR101174143B1/en active IP Right Grant
-
2009
- 2009-04-14 US US12/386,139 patent/US20090203300A1/en not_active Abandoned
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090139077A1 (en) * | 2007-11-29 | 2009-06-04 | Chan-Yong Lee | Method of manufacturing wafer carrier |
US8485864B2 (en) | 2009-06-03 | 2013-07-16 | Fujikoshi Machinery Corp. | Double-side polishing apparatus and method for polishing both sides of wafer |
US9076480B2 (en) | 2010-03-29 | 2015-07-07 | Hoya Corporation | Method of producing glass substrate for information recording medium |
Also Published As
Publication number | Publication date |
---|---|
EP1574289B2 (en) | 2019-11-06 |
EP1574289A3 (en) | 2006-06-07 |
KR101174143B1 (en) | 2012-08-14 |
EP1574289A2 (en) | 2005-09-14 |
US20050202758A1 (en) | 2005-09-15 |
EP1574289B1 (en) | 2012-10-17 |
JP2005254351A (en) | 2005-09-22 |
JP4113509B2 (en) | 2008-07-09 |
KR20060043488A (en) | 2006-05-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |