WO2004059709A1 - 塗布処理装置および塗布膜形成方法 - Google Patents
塗布処理装置および塗布膜形成方法 Download PDFInfo
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- WO2004059709A1 WO2004059709A1 PCT/JP2003/016154 JP0316154W WO2004059709A1 WO 2004059709 A1 WO2004059709 A1 WO 2004059709A1 JP 0316154 W JP0316154 W JP 0316154W WO 2004059709 A1 WO2004059709 A1 WO 2004059709A1
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- substrate
- processed
- coating
- control member
- wafer
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/6715—Apparatus for applying a liquid, a resin, an ink or the like
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/162—Coating on a rotating support, e.g. using a whirler or a spinner
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
Definitions
- the present invention relates to a coating apparatus and a coating film forming method for forming a coating film by applying a coating liquid to a substrate to be processed.
- a predetermined circuit pattern is formed on a semiconductor wafer by using a photolithography technique.
- a circuit pattern is formed by forming a resist film on a wafer, exposing the resist film in a predetermined pattern, and developing the exposed wafer.
- a predetermined amount of a resist solution is supplied to a central portion of the wafer held in a substantially horizontal posture, and then the wafer is rotated at a high speed so that the resist solution is entirely coated on the wafer.
- the so-called spin coating method is widely used.
- Japanese Patent Application Laid-Open No. 2001-189926 discloses a device arranged so as to surround the periphery of a wafer and forcibly exhausting from the bottom.
- a coating apparatus having the following formulas is disclosed.
- the atmosphere sampling port of the exhaust passage is located near the end face of the wafer, the resist solution is dried at the peripheral portion of the wafer by the airflow flowing into the exhaust passage. Is faster. As a result, Since the resist liquid flowing from the center of c toward the periphery is easily deposited on the periphery of the wafer, the thickness of the resist film is greater at the periphery of the wafer than at the center.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a coating processing apparatus and a coating film forming method capable of forming a coating film having excellent thickness uniformity.
- a coating processing apparatus for forming a coating film on a substrate to be processed
- a coating liquid supply mechanism for supplying a predetermined coating liquid to the surface of the substrate to be processed held by the holding mechanism
- a rotation mechanism for rotating the substrate to be processed held by the holding mechanism and a rotation mechanism arranged to surround the outer periphery of the substrate to be processed in proximity to the substrate to be processed, and the vertical cross-sectional shape thereof goes from the inside toward the outside. Therefore, an airflow control member whose thickness increases upward,
- a coating treatment device comprising:
- a coating processing apparatus for forming a coating film on a substrate to be processed
- a coating liquid supply mechanism for supplying a predetermined coating liquid to the surface of the substrate to be processed held by the holding mechanism;
- a rotation mechanism for rotating the substrate to be processed held by the holding mechanism;
- a processing container that accommodates the holding mechanism and that can exhaust an atmosphere around the substrate to be processed from a bottom portion;
- the processing container includes
- a cross section comprising a first cup having an outer peripheral wall surrounding the outside of the substrate to be processed, an upper ring portion having a substantially triangular cross section and projecting upward, and a lower ring portion having a substantially triangular cross section and projecting downward.
- An airflow control member having a substantially square shape, disposed inside the first cup so as to surround an outer periphery of the substrate to be processed in proximity to an end surface of the substrate to be processed;
- An exhaust flow path for substantially exhausting an atmosphere around the substrate to be processed is formed between the airflow control member and the outer peripheral wall of the first cup, and a vertex of the upper ring portion and the outer peripheral wall are formed.
- a coating processing apparatus wherein the space between the upper end of the section and the upper end of the section is an atmosphere sampling port of the exhaust passage.
- the bottom angle inside the upper ring portion in the airflow control member is preferably 24 degrees or more and 34 degrees or less, and the height of the upper ring portion is 1 O mm or more. It is preferably 18 mm or less, and the base angle inside the lower ring portion of the airflow control member is preferably 25 degrees or more and 35 degrees or less. It is preferable that the upper ring portion and the lower ring portion are integrated.
- the outer peripheral wall portion of the first cup preferably has a cylindrical vertical wall portion and an inclined wall portion which is connected to an upper end of the vertical wall portion and is inclined inward and upward.
- the portion and the outer slope of the upper ring portion of the airflow control member are substantially parallel.
- a backflow of the airflow flowing into the exhaust passage is suppressed. It is preferable to provide a projection.
- the processing container further includes a second cup having an inclined wall portion that extends obliquely outward from the lower side of the substrate to be processed, and the coating liquid substantially shaken off from the substrate to be processed is directed downward.
- a drainage flow path for draining is formed between the airflow control member and the inclined wall of the second cup, and a gap between the airflow control member and the substrate to be processed is provided with a drainage collection port in the drainage flow path. It is preferable to have such a configuration.
- the second cup has a cylindrical vertical wall extending downward from the lower end of the inclined wall, and the exhaust flow passage and the drainage flow passage are connected to the outer peripheral wall of the first cup and the vertical wall of the second cup. It is preferable that the processing unit is configured so that it merges in a gap formed between the processing vessel and the exhaust vessel and the liquid is discharged from the bottom of the processing container.
- the air flow flowing near the peripheral edge of the substrate to be processed is substantially changed so that the application liquid shaken off from the substrate to be processed is substantially guided into the drainage flow path by colliding with the inclined surface inside the lower ring portion.
- a coating processing apparatus for forming a coating film on a substrate to be processed
- a coating liquid supply mechanism for supplying a predetermined coating liquid to the surface of the substrate to be processed held by the holding mechanism
- a rotation mechanism for rotating the substrate to be processed held by the holding mechanism a processing container that accommodates the holding mechanism and that can exhaust an atmosphere around the substrate to be processed from a bottom portion;
- the processing container includes
- a first force ring having an outer peripheral wall portion surrounding the outside of the substrate to be processed, an upper ring portion having a substantially triangular vertical section and projecting upward, and a predetermined length outward and downward from an inner vertex of the upper ring portion.
- a lower ring portion having a first inclined portion that inclines, a horizontal surface portion extending horizontally outward from a lower end of the first inclined portion, and a second inclined portion that inclines outward and downward from the horizontal surface portion.
- An airflow control member disposed inside the first cup so as to surround an outer periphery of the substrate to be processed in proximity to an end surface of the substrate to be processed;
- An exhaust flow path for substantially exhausting an atmosphere around the substrate to be processed is formed between the airflow control member and the outer peripheral wall of the first cup, and a vertex of the upper ring portion and the outer peripheral wall are formed.
- a coating processing apparatus wherein the space between the upper end of the section and the upper end of the section is an atmosphere sampling port of the exhaust passage.
- the configuration other than the airflow control member can be the same as that of the coating processing apparatus according to the second aspect.
- the upper ring portion of the airflow control member used in the coating apparatus according to the third aspect is the same as the upper ring section of the airflow control member used in the coating apparatus according to the second aspect. It can be structured.
- a method for forming a coating film using the coating processing apparatus That is, according to the fourth aspect of the present invention, a step of holding the substrate to be processed in a substantially horizontal posture,
- a substantially ring-shaped airflow control member whose thickness increases upward as the vertical cross-sectional shape goes from the inside to the outside approaches the outer periphery of the substrate to be processed and surrounds the outer periphery of the substrate to be processed.
- a step of relatively adjusting the positions of the substrate to be processed and the airflow control member Supplying a predetermined coating liquid to the surface of the substrate to be processed, rotating the substrate to be processed, thereby spreading the coating liquid over the entire substrate to be processed, and forming a coating film on the substrate to be processed; ,
- a coating film forming method comprising:
- an air flow control member having a substantially quadrangular cross section composed of an upper ring portion having a substantially triangular cross section and projecting upward and a lower ring portion having a substantially triangular cross section and projecting downward is used.
- the substrate to be processed and the airflow control member are placed inside a processing container having an outer peripheral wall surrounding the outside of the processing substrate and capable of exhausting from the bottom.
- the atmosphere above the substrate to be processed be taken into the processing vessel from between the airflow control member and the outer peripheral wall.
- the vertex where the inner corner of the upper ring portion and the inner corner of the lower ring portion are at a position higher than the surface of the substrate to be processed It is preferable to arrange the airflow control member as described above, whereby the application liquid shaken off from the substrate to be processed can collide against the slope inside the lower ring portion and be guided to the lower side of the processing container.
- the influence of the airflow generated when exhausting the atmosphere around the substrate to be processed on the peripheral portion of the substrate can be reduced.
- a coating film having a uniform thickness distribution can be formed over the entire substrate.
- FIG. 1 is a plan view showing a schematic structure of a resist coating and developing system.
- FIG. 2 is a front view showing a schematic structure of a resist coating and developing processing system.
- FIG. 3 is a rear view showing a schematic structure of a resist coating and developing processing system.
- FIG. 4 is a sectional view showing a schematic structure of a resist coating unit
- FIG. 5 is an enlarged view of a region A shown in FIG.
- FIG. 6A is an explanatory diagram showing a schematic structure of a processing cup of Comparative Example 1
- FIG. 6B is an explanatory diagram showing a schematic structure of a processing cup of Comparative Example 2
- FIG. FIG. 7 is an explanatory diagram showing a schematic structure of a processing cup of an example
- FIG. 7 is a graph showing a range of a resist film formed using the processing cup of Comparative Example 1 and the example and a value of 30;
- FIG. 8 is a graph showing a change in thickness of each resist film formed using the processing cups of Comparative Example 1, Comparative Example 2 and Example in the radial direction of the wafer.
- FIG. 9 is a graph showing a change in the thickness of the resist film in the radial direction of the wafer when the exhaust pressure is changed using the processing cup of the embodiment.
- FIG. 10 shows another resist coating unit.
- FIG. 3 is a cross-sectional view showing a schematic structure of FIG.
- a resist coating / developing apparatus that includes a resist coating unit that forms a resist film by applying a resist solution to a semiconductor wafer and performs a series of processes from the formation of the resist film to the development process is taken as an example. I do.
- FIG. 1 is a schematic plan view showing a resist coating and developing system 1
- FIG. 2 is a front view thereof
- FIG. 3 is a rear view thereof.
- the resist coating and developing system 1 includes a cassette station 10 as a transfer station, a processing station 11 having a plurality of processing units, and a processing station 1 1 And an interface face station 12 for transferring a wafer W to and from an exposure apparatus (not shown) provided adjacent to the apparatus.
- the cassette station 10 has a cassette mounting table 20 for mounting a wafer cassette CR capable of storing a plurality of (for example, 25) wafers W.
- the wafer cassette CR accommodating the wafer W to be processed in the resist coating / developing processing system 1 is carried into the cassette mounting table 20 of the cassette station 10 from another system.
- the wafer force set CR accommodating the wafer W accommodating the processed wafer W in the resist coating / image processing system 1 is carried out from the cassette mounting table 20 to another system.
- a plurality of (four in FIG. 1) positioning projections 20a are formed on the cassette mounting table 20 along the X direction shown in FIG.
- the wafer cassettes CR are placed in a row at the positions of the positioning projections 20a with the respective wafer entrances facing the processing station 11 side.
- the wafers W are arranged in a substantially horizontal posture at predetermined intervals in the vertical direction (Z direction).
- the cassette station 10 also includes a wafer transfer mechanism 21 that transfers the wafer W between the cassette mounting table 20 and the processing station 11.
- the wafer transfer mechanism 21 is movable in the direction of arranging the wafers W in the wafer cassette CR (Z direction) and in the direction of arranging the cassettes (X direction). It is provided with a wafer transfer pick 21a that can move back and forth in the direction and can rotate in a horizontal plane (X-Y plane). Therefore, the wafer transfer pick 21 a can selectively access the wafer W stored at a predetermined position of the wafer cassette CR mounted on the cassette mounting table 20.
- ALAM Rye instrument Interview knit
- the processing station 11 includes a plurality of processing units for performing a series of steps when applying and developing a resist solution on the wafer W.
- the plurality of processing units are arranged at predetermined positions in multiple stages.
- One wafer W is processed in each processing unit.
- the processing station 11 has a wafer transfer path 22a in the center, in which a main wafer transfer mechanism 22 is provided, and all around the wafer transfer path 22a.
- the plurality of processing units are divided into a plurality of processing units, and each processing unit has a plurality of processing units arranged in multiple stages along the vertical direction.
- the main wafer transfer mechanism 22 has a structure in which a vertically movable wafer transfer device 76 is provided inside a cylindrical support 79.
- the cylindrical support 79 is rotatable by a rotational driving force of a motor (not shown), and the wafer transfer device 76 is rotatable integrally with the cylindrical support 79.
- the wafer transfer device 76 is provided with a plurality of holding arms 78 that are movable in the front-rear direction of the transfer base 77, and transfer the wafer W between the processing units by the holding arms 78. Has been realized.
- the resist coating and developing system 1 four processing unit, G 2, G 3, G 4 are actually arranged around the wafer transport path 2 2 a.
- the first and second processing units, G 2 is disposed parallel to the front side of Les resist coating and developing system 1 (the front side in FIG. 1)
- the third processing section G 3 are cassette disposed adjacent to the station 1
- the fourth processing unit G 4 are are arranged adjacent to the I interface station 1 2.
- the resist coating and Te developing system 1 smell, summer to be able to place the processing unit G 5 of the fifth to the rear portion Tei You.
- the first processing unit is, as shown in FIG. 2, two spinner-type processing units for performing a predetermined processing by placing a wafer W on a spin chuck (not shown) in a cup (CP).
- a resist coating unit (COT) and a developing unit (DEV) for developing the resist pattern are stacked in two layers from the bottom.
- the second processing unit G 2 which is two spin Na type processing unit resist coating unit (COT) and the current image processing unit (DEV) are two-tiered from the bottom in order.
- the structure of the resist coating unit (COT) will be described later in detail.
- the processing Yunitto oven type by mounting the table SP mounting the wafer W performs predetermined processing that are stacked in multiple stages. That is, an adhesion unit (AD) that performs a so-called hydrophobic treatment to improve the fixability of the resist, an alignment unit (AL IM) that performs alignment, and an extension unit (EXT) that carries in and out the wafer W.
- the cooling plate unit (COL) for cooling, and the four hot plate units (HP) for heating the wafer W coated with the resist solution or the wafer W after exposure processing are arranged in eight stages from the bottom. Are stacked.
- a cooling plate unit (COL) may be provided instead of the alignment unit (AL IM), and the cooling plate unit (COL) may have an alignment function.
- oven-type processing units are multi-tiered.
- a cooling plate unit (COL), an extension / cooling plate unit (EXTC 0 L) which is a wafer loading / unloading section equipped with a cooling plate, an extension unit (EXT), and a cooling plate Unit (CO L), and four hot plate units (HP) are stacked in eight steps from the bottom.
- processing unit G 5 of the fifth provided on the rear side of the main wafer transfer mechanism 2 2, processing unit G 5 of the fifth, laterally relative to the main wafer transfer mechanism 2 2 along a guide rail 2 5 Can be moved.
- the space portion by sliding along the guide rail 2 5 this can be secure, maintenance for the main wafer transfer mechanism 2 2 Work can be easily performed from behind.
- the portable face station 12 has a portable pickup cassette PR and stationary type buffer force set BR on the front, and a peripheral exposure device on the back. 23, and a structure in which a wafer transfer mechanism 24 is disposed at the center thereof.
- the wafer transfer mechanism 2 has a wafer transfer arm 24a.
- the wafer transfer arm 24 a includes the two cassettes PR′BR, the peripheral exposure device 23, the extension unit (EXT) belonging to the fourth processing section G 4 of the processing station 11, and the interface station 1. It is movable in the Z direction, and is rotatable in a horizontal plane, and is movable in and out of a horizontal plane so that it can access a wafer transfer table (not shown) of the exposure apparatus adjacent to 2. is there.
- the wafer cassette CR containing the unprocessed wafer W is placed on the cassette mounting table 20.
- the pick 2 1 a force eject the wafers W one from which to access the wafer cassettes CR, it conveyed to the third processing section G 3 E box tension Interview knit (EXT).
- This wafer W is transferred by the wafer transfer device 76 of the main wafer transfer mechanism 22. Then, it is carried into the processing station 11 from the extension unit (EXT). Then, the wafer W, after being Araimen Bok in the third processing unit G 3 Araimento unit (AL IM), is conveyed to the adhesion process unit (AD), where hydrophobization of the order to increase the fixing property of the resist Processing (HMDS processing) is performed. Since the HMDS process involves heating, the wafer W after the HMDS process is transferred by the wafer transfer device 76 to a cooling plate unit (COL), where it is cooled.
- AD adhesion process unit
- HMDS processing hydrophobization of the order to increase the fixing property of the resist Processing
- the wafer W cooled in the cooling plate unit (COL) after the processing in the adhesion processing unit (AD) or the wafer W not processed in the adhesion processing unit (AD) is continuously processed by the wafer transfer device 76.
- the wafer W is transferred to the resist coating unit (COT), where a resist solution is applied to the surface of the wafer W to form a resist film (coating film).
- COT resist coating unit
- the wafer W is transported to the third processing section G 3 or the fourth processing unit G 4 of the hot plate unit (HP), where it is Prevailing one click process, and then either cooling It is transported to the plate unit (COL) where it is cooled.
- HP hot plate unit
- COL plate unit
- the wafer W is being transported to the third processing unit G 3 ⁇ Lai Instrument Interview knit (AL IM), where it is Araimento, the fourth processing unit G 4 E click scan tension Interview Stevenage Bok (EXT) Is transferred to the interface face station 12 via the.
- Araimento Lai Instrument Interview knit
- EXT click scan tension Interview Stevenage Bok
- the wafer W is subjected to a peripheral exposure process by the peripheral exposure device 23, thereby removing extra resist. Thereafter, the wafer W is transferred to an exposure apparatus (not shown) provided adjacent to the interface station 12 where the wafer W is transferred. An exposure process is performed on the resist film in a predetermined pattern.
- Wafer W which exposure processing has been completed is again conveyed back to the I interface station 1 2, the E box tension unit included in the fourth processing unit G 4 by the wafer carrier mechanism 24 (EXT).
- the wafer W is transported to the third processing section G 3 or E of the fourth processing section G 4 Tsu preparative plate unit by the wafer transfer apparatus 76 (HP), where Ichiku processing base post Ekusupoja the wafer W Is applied.
- the wafer W is cooled to a predetermined temperature, and the wafer W is thereafter transferred to a cooling plate unit (COL) as needed, where it is further cooled.
- COL cooling plate unit
- FIG. 4 is a schematic sectional view showing one embodiment of a resist coating unit (COT), and FIG. 5 is an enlarged view of a region A shown in FIG.
- the resist coating unit (COT) includes a spin chuck 41 that holds the wafer W in a substantially horizontal posture, a rotation mechanism 42 that rotates a spin chuck 41, a lifting mechanism 43 that moves the spin chuck 41 up and down, and a spin chuck 41.
- the apparatus is provided with a processing capacity 50 for accommodating, and a resist coating nozzle 91 for supplying a resist solution to the surface of the wafer W held by the spin chuck 41. From above the processing cup 50, clean air flows from the filter fan unit (FFU) (not shown) as a downflow to the processing cup 50. Supply.
- FFU filter fan unit
- the resist coating nozzle 91 is held by a nozzle holding arm 92.
- the nozzle holding arm 92 has a nozzle moving mechanism 93 composed of a horizontal moving mechanism such as a slide mechanism and a rotating mechanism and an elevating mechanism (vertical moving mechanism). , And can be moved to and away from the surface of the wafer W.
- the resist solution is sent to the resist coating nozzle 91 from the resist solution sending device 94.
- the spin chuck 41 sucks and holds the wafer W under reduced pressure by a suction mechanism (not shown).
- the wafer W is sucked and held on the spin chuck 41, and a predetermined amount of resist solution is supplied to almost the center of the wafer W, and then the spin chuck 41 is rotated by the rotating mechanism 42 so that the resist film is formed on the wafer W. It is formed. At this time, the excess resist solution scattered from the wafer W to the surroundings is collected by the processing cup 50.
- the processing cup 50 is generally arranged so as to surround the outside of the wafer W, and the inside of the first cup 51 is arranged so as to be close to and surround the wafer W. And a second cup 53 disposed below the wafer W.
- the airflow control member 52 is connected and held to the first cup 51 by connection members (not shown) provided at a plurality of locations on the outer periphery.
- the first cup 51 is composed of a cylindrical first vertical wall 71a and a first inclined wall 71b that is connected to the upper end of the first vertical wall 71a and tilts inward and upward. It has an outer peripheral wall 61a, a cylindrical intermediate wall 61b provided inside the first vertical wall 71a, and a bottom wall 61c.
- the airflow control member 52 has a substantially quadrangular cross-sectional shape composed of an upper ring member 62a having a generally triangular cross section and convex upward and a lower ring member 62b having a substantially triangular cross section and convex downward. are doing.
- the upper ring member 62a and the lower ring member 62b may be integrally formed.
- the second cup 53 includes a second inclined wall 63 a extending outward from the lower side of the wafer W obliquely downward, and a cylindrical second communicating with a lower end of the second inclined wall 63 a. It has a vertical wall 63 b and a cylindrical inner peripheral wall 63 c arranged inside the intermediate wall 61 b of the first cup 51.
- an exhaust passage 55 is provided between the outer peripheral wall 61a and the airflow control member 52, and a drainage flow is provided between the lower ring member 62b and the second inclined wall 63a.
- the path 56 is an exhaust where the exhaust channel 55 and the drain channel 56 join between the first vertical wall 71 a and the second vertical wall 63 b.
- a drainage chamber 58 is formed between the wall 61a and the intermediate wall 61b, and an exhaust chamber 59 is formed between the intermediate wall 61b and the inner peripheral wall 63c.
- a drain port 74 is formed in the portion of the bottom wall 61 c where the drain chamber 58 is formed, and an exhaust port is formed in the portion of the bottom wall 61 c where the exhaust chamber 59 is formed. 7 2 are formed.
- a drain pipe 75 is attached to the drain port 74, and an exhaust pipe 73 is attached to the exhaust port 72.
- An exhaust device (not shown) is provided downstream of the exhaust pipe 73, and the atmosphere around the wafer W is exhausted from the bottom through the exhaust port 72 by operating the exhaust device.
- the atmosphere around the wafer W is substantially exhausted through the exhaust passage 55, and the resist solution that is shaken off from the wafer W when the wafer W is rotated is rotated. Drainage is performed substantially through a drainage channel 56. Next, this will be described in more detail.
- the exhaust intake port (hereinafter referred to as “atmosphere sampling port”) 55 a in the exhaust passage 55 is an upper end portion of the first inclined wall 71 b of the first cup 51. And the apex of the upper ring member 62 a of the airflow control member 52.
- the resist coating unit (COT) The air sampling port 55 a is provided on the upper outside of the wafer W.
- a resist solution sampling port 56 a for allowing the resist solution to flow into the drainage channel 56 is formed between the wafer W and the airflow control member 52.
- the airflow control member 52 is arranged close to the wafer W such that the width a of the resist liquid sampling port 56a is narrower than the width of the atmosphere sampling port 55a. Therefore, the atmosphere around the wafer W easily flows from the atmosphere sampling port 55a into the exhaust channel 55, but hardly flows into the drain channel 56 through the resist solution sampling port 56a. In this manner, the exhaust of the atmosphere substantially around the wafer W is performed through the exhaust channel 55.
- the resist liquid shaken off from the wafer W when the spin chuck 41 is rotated is substantially guided into the drain flow path 56 by colliding with the inclined surface inside the lower ring member 62 b.
- the airflow flowing near the periphery of the wafer W rises substantially along the inclined surface inside the upper ring member 62a, and then flows into the exhaust channel 55 from the atmosphere sampling port 55a.
- the height position of the apex formed by combining the inner corner of the upper ring member 62 a and the inner corner of the lower ring member 62 b corresponds to the height of the wafer W held by the spin chuck 41. It is higher than the height of the surface, for example, by about 0.1 to 1 mm.
- the airflow control member 52 be disposed so that the airflow control member 52 is arranged as follows. Thereby, the effect of making the film thickness distribution uniform can be more remarkably obtained. Also, the air flow control member 52 has a first cup (an apex of the upper ring member 62 a) formed so that the air flow from the wafer W side can easily flow into the atmosphere sampling port 55 a. 51 It is arranged so as to be lower than the vertex of 1 (the top of the first inclined wall 71b).
- the inner base angle of the upper ring member 62 a constituting the airflow control member 52 be 24 degrees or more and 34 degrees or less. If the bottom angle 0 i of the upper ring member 62 a becomes smaller than 24 degrees, the position of the atmosphere sampling port 55 a is lowered and approaches the wafer W, so that the airflow wafer flowing into the exhaust passage 55 The influence of W on the peripheral edge is increased, and as a result, the resist film is likely to be thick at the peripheral edge of wafer W. Conversely, when the bottom angle S of the upper ring member 62 a becomes larger than 34 degrees, the airflow from the central portion of the wafer W toward the outer periphery collides with the inclined surface inside the upper ring member 62 a. This tends to generate an airflow that returns to the center portion, and the mist of the resist solution contained in the airflow adheres to the resist film, thereby easily causing contamination of the resist film.
- Base angle theta 3 of the outer upper ring member 6 2 a is a constant width in the exhaust passage 5 5 is defined adapt to the inclination angle of the first inclined wall 7 1 b to be secure, if example embodiment , 22 degrees or more and 32 degrees or less.
- the height of the upper ring member 62 a is also set to a suitable value according to the size of the wafer W. Is set. For example, if the diameter of the wafer W is 30 O mm, the height ⁇ 2 of the upper ring member 62 a should be 10 mm or more and 18 mm or less (for example, 14 mm). it can.
- the lower ring member 6 2 b base angle theta 2 inside of which constitutes the airflow control member 5 2, it is preferably 3 5 degrees or less than 2 5 degrees. Bottom of lower ring member 6 2 b When angle theta 2 is larger than 35 degrees, rebound resist solution spun off from the wafer W collides with the inner side of the inclined wall of the lower ring member 6 2 b, easily soiled peripheral portion of the wafer W. On the other hand, when the base angle 0 2 is smaller than 25 degrees, the resist liquid shaken off from the wafer W and the airflow generated due to the scattering of the resist liquid reach the exhaust flow path 55, thereby causing The airflow is disturbed, and the exhaust airflow flowing through the exhaust passage 55 may flow backward.
- the mist of the resist solution contained in the exhaust gas flow may be reduced. It attaches to the surface of the wafer W and causes a problem that the surface of the resist film is contaminated. Therefore, by providing a projection 61 d protruding toward the atmosphere sampling port 55 a at the upper end of the first inclined wall 71 b of the first cup 51, the reverse flow of the airflow flowing into the exhaust flow path 55 is prevented. It is preferable to suppress.
- the processing of the wafer w in the resist coating unit (COT) having the above configuration is performed by the steps described below.
- the resist coating nozzle 91 is moved to the center of the wafer W to supply a predetermined amount of the resist solution to the surface of the wafer W, and the spin chuck 41 is rotated. As a result, the resist liquid is spread around the periphery of the wafer W by centrifugal force, and the resist film is dried by a downflow corresponding to the wafer W and an air current generated around the wafer W.
- a part of the resist liquid shaken off from the wafer W may adhere to the inner slope of the upper ring member 62 a of the airflow control member 52, and the resist liquid thus adhered to the airflow control member 52 Is removed when the processing cup 50 is washed.
- a pretreatment such as applying a solvent such as a thinner to the surface of the wafer W so that the resist solution easily spreads on the surface of the wafer W. .
- the spin chuck 41 After the rotation of the spin chuck 41 is stopped, the spin chuck 41 is raised to a predetermined height, and the holding arm 78 is moved under the spin chuck 41. Next, when the spin chuck 41 is lowered, the wafer W is transferred from the spin chuck 41 to the holding arm 78 on the way. The holding arm 78 transfers the held wafer W to one of the hot plate units (HP), where the wafer W is subjected to a pre-bake process.
- Table 1 and Figures 7 and 8 show the resist film on the wafer W of 300 mm ⁇ by changing the rotation speed of the spin chuck 41 using the various processing powers shown in Figures 6A to 6C. The results of film thickness distribution and the like in the case where is formed are shown.
- FIG. 6A to 6C show a portion near the outside of the wafer W as in FIG. 5, and the other parts have the same configuration.
- the airflow control member 52 is removed from the processing cup 50, and the tip of the first inclined wall 71b of the first cup 51 is placed on the periphery of the wafer W. It has a structure in which the processing cup 50 is deformed so as to be close to each other.
- the first cup constituting the processing cup of Comparative Example 1 is indicated by reference numeral 89 in FIG. 6A.
- FIG. 6B is roughly the same as the processing cup 50, the upper ring member 62 a of the airflow control member 52 is removed from the processing cup 50, and the lower ring member 62 b is left. And, the tip of the first inclined wall 71b of the first cup 51 shown in FIG. 4 is deformed so as to be closer to the periphery of the wafer W (this is referred to as "first cup 89 '"). have.
- the processing capacity of the embodiment shown in FIG. 6C is the same as that of the processing cup 50 according to the present invention shown in FIGS. 4 and 5.
- the measurement of the thickness of the resist film formed on the wafer W was performed at a point on the circumference 3 mm inside the outer peripheral end face of the wafer W as the outermost circumference measurement point, and was performed at a plurality of locations on the diameter within this circumference.
- Table 1 shows the range of the measurement results and the value of 3 ⁇ .
- “range” indicates the difference between the maximum value and the minimum value of the measured values, and the maximum value of the film thickness is on the outermost circumference (that is, on the circumference 3 mm inward from the outer peripheral end face of the wafer W). ), A small value in this range indicates that the jump of the outer peripheral portion of the resist film is small.
- Comparative Example 1 is the standard deviation of the film thickness distribution, and a small value indicates that the resist film has excellent thickness uniformity.
- Table 1 it can be seen that the range and the value of 3 ⁇ are smaller in Comparative Example 2 than in Comparative Example 1, and the range and the value of 3 ⁇ are further smaller in Example. .
- Comparative Example 1 and Comparative Example 2 Since the atmosphere sampling port is located closer to the end face of the wafer W as compared with the embodiment, the resist film is easily dried at the peripheral portion of the wafer W due to the influence of the exhaust airflow, and the resist film becomes thicker. It is considered that Note that, in Comparative Example 1, the resist film is considered to be thicker in the peripheral portion of the wafer W by drying the resist film by the airflow flowing in the vertical direction hitting the peripheral portion of the wafer W as compared with Comparative Example 2.
- FIG. 7 is a graph showing ranges and values of 3 ⁇ at positions of 2 mm, 3 mm, and 5 mm from the outer peripheral end surface of the wafer W in Comparative Example 2 and Example. From FIG. 7, it can be seen that in the example, the jump of the resist film at the peripheral portion of the wafer W is suppressed.
- FIG. 8 shows a change in the thickness of the resist film in the radial direction of the wafer W when the rotation speed of the spin chuck 41 is 800 rpm. From FIG. 8, it can be seen that in the example, the jump of the resist film at the peripheral portion of the wafer W is suppressed. 7 and 8 also show that the use of the processing cup 50 of the embodiment makes it possible to form a resist film having a uniform film thickness over the entire wafer W. As shown in FIG. 8, in the case of the example, the film thickness was reduced by 10 nm as a whole as compared with Comparative Examples 1 and 2. Thereby, it is possible to narrow down to a predetermined film thickness.
- FIG. 9 shows the resist film thickness when the exhaust pressure at the exhaust port 72 is changed while the rotation speed of the spin chuck 41 is kept constant.
- the results (range and 3 ⁇ ) measured at multiple points on the diameter within this circumference are shown with the upper point as the outermost circumference measurement point.
- the exhaust pressure in the exhaust port 72 is changed, the exhaust pressure in the exhaust channel 55 and the exhaust channel 56 changes.
- FIG. It was confirmed that such an influence of the exhaust pressure change hardly appeared. This indicates that the atmosphere around the wafer W can be reliably evacuated while keeping the thickness of the resist film constant.
- the shape of the airflow control member is not limited to the shapes shown in FIGS.
- FIG. 10 shows a processing cup provided with an airflow control member 52 ′.
- FIG. 4 is a schematic sectional view of a resist coating unit (COT) ′ having 50 ′.
- the resist coating unit (COT) 'and the above-described resist coating unit (COT) have the same structure except that the shape of the airflow control member provided in the processing cup is different.
- the airflow control member 52 ′ included in the processing cup 50 ′ is composed of an upper ring member 62a having a substantially triangular vertical cross section and convex upward, and a predetermined length from the inner vertex to the outer lower side of the upper ring member 62a.
- the first inclined portion 8 1a which is inclined and the horizontal surface portion 8 1b extending outward from the lower end of the first inclined portion 8 1a in the horizontal direction, and downward from the outer end of the horizontal surface portion 8 1b And a lower ring member 62b 'having a second inclined portion 81c that is inclined.
- it is integral with 6 2 b ′.
- the upper ring member 62a is common to the processing cup 50 and the processing cup 50 '.
- the first inclined portion 81a of the lower ring member 62b ' serves to guide the resist solution shaken off from the wafer W downward.
- the width of the drainage channel 56 ′ formed between the second cup 53 and the lower ring member 62 b is wider than in the processing cup 50. This is the Width 3 3 of the exhaust / drainage channel 5 7 in the process cup 5 0
- S 2 is preferably This does not adversely affect the drainage Z exhaust characteristics. Therefore, a resist coating unit having a processing force 50 ′ having an airflow control member 52 ′ is provided.
- (COT) ′ the uniformity of the thickness of the resist film formed on the wafer W can be improved.
- the holding arm 78 can be moved up and down, so that the position where the wafer W is held without fixing the spin chuck 41 is fixed and the spin chuck is fixed.
- the processing cup 50 may be moved up and down so as not to hinder the transfer of the wafer W.
- the substrate is not limited to a semiconductor wafer, and may be a glass substrate for an FPD (flat panel display).
- the coating solution is not limited to the resist solution, and may be, for example, a chemical solution used for forming an interlayer insulating film by a spin coating method.
- the coating apparatus of the present invention is suitable for forming a coating film such as a resist film on a substrate such as a semiconductor wafer.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP03780822A EP1577930A4 (en) | 2002-12-26 | 2003-12-17 | COATING DEVICE AND METHOD FOR FORMING COATING FILM |
AU2003289383A AU2003289383A1 (en) | 2002-12-26 | 2003-12-17 | Coating device and coating film forming method |
US10/538,727 US7575634B2 (en) | 2002-12-26 | 2003-12-17 | Coating device and coating film forming method |
US12/491,424 US7790227B2 (en) | 2002-12-26 | 2009-06-25 | Coating process apparatus and coating film forming method |
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JP2002376233A JP4318913B2 (ja) | 2002-12-26 | 2002-12-26 | 塗布処理装置 |
JP2002-376233 | 2002-12-26 |
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US10538727 A-371-Of-International | 2003-12-17 | ||
US12/491,424 Division US7790227B2 (en) | 2002-12-26 | 2009-06-25 | Coating process apparatus and coating film forming method |
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EP (1) | EP1577930A4 (ja) |
JP (1) | JP4318913B2 (ja) |
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CN (1) | CN100380584C (ja) |
AU (1) | AU2003289383A1 (ja) |
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2003
- 2003-12-17 KR KR1020057011969A patent/KR100954901B1/ko active IP Right Grant
- 2003-12-17 AU AU2003289383A patent/AU2003289383A1/en not_active Abandoned
- 2003-12-17 EP EP03780822A patent/EP1577930A4/en not_active Withdrawn
- 2003-12-17 WO PCT/JP2003/016154 patent/WO2004059709A1/ja active Application Filing
- 2003-12-17 US US10/538,727 patent/US7575634B2/en not_active Expired - Fee Related
- 2003-12-17 CN CNB2003801075768A patent/CN100380584C/zh not_active Expired - Fee Related
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2009
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CN1912697B (zh) * | 2005-07-11 | 2010-09-08 | 芝浦机械电子株式会社 | 基板的旋转处理装置 |
TWI405623B (zh) * | 2005-07-11 | 2013-08-21 | Shibaura Mechatronics Corp | 基板之旋轉處理裝置 |
Also Published As
Publication number | Publication date |
---|---|
US7575634B2 (en) | 2009-08-18 |
US7790227B2 (en) | 2010-09-07 |
US20060068093A1 (en) | 2006-03-30 |
CN100380584C (zh) | 2008-04-09 |
AU2003289383A1 (en) | 2004-07-22 |
JP4318913B2 (ja) | 2009-08-26 |
EP1577930A1 (en) | 2005-09-21 |
CN1732555A (zh) | 2006-02-08 |
US20090258139A1 (en) | 2009-10-15 |
JP2004207573A (ja) | 2004-07-22 |
KR100954901B1 (ko) | 2010-04-27 |
KR20050086941A (ko) | 2005-08-30 |
EP1577930A4 (en) | 2010-01-06 |
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