WO2003072856A1 - Procede de production de semi-conducteur a base d'un compose nitrure du groupe iii - Google Patents
Procede de production de semi-conducteur a base d'un compose nitrure du groupe iii Download PDFInfo
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- WO2003072856A1 WO2003072856A1 PCT/JP2003/001990 JP0301990W WO03072856A1 WO 2003072856 A1 WO2003072856 A1 WO 2003072856A1 JP 0301990 W JP0301990 W JP 0301990W WO 03072856 A1 WO03072856 A1 WO 03072856A1
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- Prior art keywords
- compound semiconductor
- group iii
- iii nitride
- sapphire substrate
- nitride compound
- Prior art date
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 89
- -1 nitride compound Chemical class 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 63
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 49
- 239000010980 sapphire Substances 0.000 claims abstract description 49
- 238000005546 reactive sputtering Methods 0.000 claims abstract description 6
- 238000001312 dry etching Methods 0.000 claims abstract description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 48
- 150000004767 nitrides Chemical class 0.000 claims description 47
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000012986 modification Methods 0.000 claims description 11
- 230000004048 modification Effects 0.000 claims description 11
- 238000005530 etching Methods 0.000 claims description 10
- 238000002407 reforming Methods 0.000 claims description 4
- 208000012868 Overgrowth Diseases 0.000 abstract 1
- 230000012010 growth Effects 0.000 description 16
- 238000000407 epitaxy Methods 0.000 description 8
- 239000012535 impurity Substances 0.000 description 5
- 238000000927 vapour-phase epitaxy Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 4
- 238000002128 reflection high energy electron diffraction Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910021480 group 4 element Inorganic materials 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 238000001947 vapour-phase growth Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910021476 group 6 element Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 1
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C30B29/403—AIII-nitrides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/18—Epitaxial-layer growth characterised by the substrate
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/0242—Crystalline insulating materials
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02455—Group 13/15 materials
- H01L21/02458—Nitrides
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/0254—Nitrides
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H—ELECTRICITY
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02631—Physical deposition at reduced pressure, e.g. MBE, sputtering, evaporation
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- H—ELECTRICITY
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02636—Selective deposition, e.g. simultaneous growth of mono- and non-monocrystalline semiconductor materials
- H01L21/02639—Preparation of substrate for selective deposition
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- H—ELECTRICITY
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02636—Selective deposition, e.g. simultaneous growth of mono- and non-monocrystalline semiconductor materials
- H01L21/02647—Lateral overgrowth
Definitions
- the present invention relates to a method for producing a group III nitride compound semiconductor.
- the present invention relates to a method of manufacturing a group III nitride compound semiconductor using lateral epitaxial growth (ELO) growth, a group III nitride compound semiconductor device, and a group III nitride compound semiconductor substrate.
- the group III nitride-based compound semiconductors are, for example, binary systems such as A1N, GaN, and InN, Al.Ga ⁇ N, Al x Into X N, and GaJn ⁇ (all 0 ⁇ ⁇ 1).
- Al x Ga y I ni which includes the ternary system of Al x Ga y In xy N (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ x + y ⁇ 1) Some are represented by _ x _ y N (0 ⁇ x ⁇ l, 0 ⁇ y ⁇ l, 0 ⁇ x + y ⁇ l).
- a group III nitride-based compound semiconductor is simply referred to as a conduction type!
- the expression also includes group III nitride-based compound semiconductors doped with an impurity for the) -type or n-type. Background technology>
- Group III nitride-based compound semiconductors are, for example, light-emitting devices, which are direct-transition semiconductors whose emission spectrum ranges from ultraviolet to red, and include light-emitting diodes (LEDs) and laser diodes (LDs). It is applied to light emitting devices.
- LEDs light-emitting diodes
- LDs laser diodes
- the bandgap is wide, stable operation can be expected at higher temperatures than devices using other semiconductors, and applications to transistors such as FETs have been actively developed.
- As arsenic
- development of various semiconductor devices in general is expected from an environmental point of view.
- a sapphire is usually used as a substrate and is formed thereon.
- a mask is formed on a part of the upper surface to form a group III nitride-based compound semiconductor.
- III-nitride compound semiconductor with few threading dislocations on top of the mask by vertical and lateral epitaxy growth of the group III nitride compound semiconductor from the area where no mask is formed
- the technique described in the publication requires that the group III nitride compound semiconductor be grown twice with the mask formed therebetween. . Further, in the technology described in the publication, a group III nitride-based compound semiconductor with good adhesion is not formed on the upper portion of the mask-formed portion. A space is easily generated between the element and the element, and when the element is separated in a later step, peeling, cracking, or chipping occurs at the part where the space is generated.
- the present invention has been made in order to solve the above-mentioned problems, and a group III nitride-based compound semiconductor layer in which threading dislocations are suppressed is formed in a small number of steps as a whole, and peeling, cracking, and chipping are caused. It is intended to provide a semiconductor element in which the occurrence of blemishes hardly occurs.
- a method for producing a Group III nitride-based compound semiconductor in which a Group III nitride-based compound semiconductor is grown on a sapphire substrate via an A1N buffer layer includes a step of modifying at least a part of the surface of the sapphire substrate by dry etching, a step of forming an A1N buffer layer on the modified sapphire substrate, and a step of forming a desired group III nitride-based material.
- the sapphire substrate surface is modified in the form of dots, stripes, grids, or other islands on the plane.
- the sapphire substrate is etched by the reforming process, and its depth is desirably less than the thickness of the A1N buffer layer.
- the sapphire substrate is a substrate having the A surface as a main surface.
- a group III nitride-based compound semiconductor device can be formed by forming a group III nitride-based compound semiconductor and then stacking a different group III nitride-based compound semiconductor layer thereon.
- a group III nitride-based compound semiconductor substrate can be obtained by removing substantially all parts other than the group II nitride-based compound semiconductor grown vertically and horizontally in the epitaxial direction.
- a technique for laterally epitaxially growing a group III nitride compound semiconductor by providing a step or surface roughness on the substrate surface has been proposed.
- the present inventors have found a method of manufacturing a group III nitride-based compound semiconductor which is particularly effective by combining a layer and a method of forming the layer.
- the surface modification of the sapphire substrate does not need to form a step as large as 0.1 ⁇ , but can be achieved by etching in a very short time.
- the epitaxial growth of the group III nitride compound semiconductor can be performed continuously from the vertical and horizontal epitaxial growth on the A1N buffer layer, and the A1N buffer layer is formed by reactive sputtering.
- 1 (a) to 1 (i) are cross-sectional views showing steps for manufacturing a group III nitride-based compound semiconductor according to one embodiment of the present invention.
- Figure 2 (a) is a photograph of the RHEED image of the A1N layer 4a formed on the unmodified part of the sapphire substrate
- Figure 2 (b) is the sapphire substrate after the modification. It is a photograph figure of the RHEED image of A1N layer 4b formed on the part.
- the group III nitride-based compound semiconductor of the present invention was produced by vapor phase growth by metalorganic compound vapor phase epitaxy (hereinafter, referred to as “M0VPE”).
- the gases used were ammonia (NH 3 ), carrier gas (3 ⁇ 4 or N 2 ), trimethyl gallium (Ga (CH 3 ) 3 , hereinafter referred to as “TMG”) and trimethyl aluminum (A1 (CH 3 )). 3 , hereinafter referred to as “TMA”), trimethylindium (In (CH 3 ) 3 , hereinafter referred to as “TMI”), cyclopentagenenyl magnesium (Mg (C 5 H 5 ) 2 , hereinafter referred to as “Cp 2 Mgj).
- the A surface cleaned by organic cleaning was used as the main surface, that is, the crystal growth surface, and a single-crystal sapphire substrate 1 was vapor-deposited with a 50 nm thick Ni film 2 (FIG. 1 (a)).
- a photoresist 3 was coated, and a pattern jungle was formed on the A surface, that is, on the flat surface in a stripe shape by photolithography. The patterning was performed so that the width and the interval of the photoresist 3 were both 5 / xm and the direction perpendicular to the c-axis of the sapphire substrate 1 (Fig.
- a high-purity metallic aluminum was used as a target, and a buffer layer 4 made of A1N was formed by a reactive sputtering method in a nitrogen gas.
- the buffer layer was formed to a thickness of about 60 nm on the entire surface of the A surface of the sapphire substrate (Fig. 1 (g)).
- FIG. 2 (a) shows an RHEED image of the A1N layer 4a formed on the unmodified portion of the sapphire substrate. Polycrystalline spots are observed.
- FIG. 2 (b) shows an RHEED image of the A1N layer 4b formed on the modified portion of the sapphire substrate. No spot was observed.
- the A1N layer 4a formed on the unmodified portion of the sapphire substrate functions as a buffer layer, but the A1N layer 4a formed on the modified portion of the sapphire substrate. Since the layer 4b does not function as a buffer layer, the nuclei of the group III nitride-based compound semiconductor are not generated when epitaxy of the group III nitride-based compound semiconductor is performed thereafter. As a result, vertical and horizontal growth can be achieved around the A1N layer 4a formed on the unmodified portion of the sapphire substrate.
- the temperature of the sapphire substrate 1 was maintained at 1100 ° C with a MOCVD device, and was introduced at 20 L / min, ⁇ 3 was introduced at 10 L / min, and TMG was introduced at 5 / imol / min to modify the sapphire substrate.
- a GaN layer 5 was formed by vertical and horizontal epitaxy (FIG. 1 (h)) centering on the A1N layer 4a formed on the untreated portion (FIG. 1 (i)). Since the A1N layer 4b formed on the modified portion of the sapphire substrate does not function as a buffer layer for growing the GaN layer 5, the GaN layer 5b may be grown depending on the growth from the A1N layer 4b. Is not formed, but is in close contact with the GaN layer 5 formed by vertical and horizontal epitaxy around the A1N layer 4a formed on the unmodified portion of the sapphire substrate. [A1N buffer layer by MO CVD]
- the formation of the group III nitride semiconductors after the formation of the A1N buffer layer by the reactive sputtering had a significantly different effect from the case where they were replaced with other ones. Also, in the surface modification, it was not necessary to use long-time etching or dicing to generate a step, and it was achieved in an extremely short time. Further, the A1N layer 4b above the modified portion of the sapphire substrate is made of GaN formed by vertical and lateral epitaxy around the A1N layer 4a above the unmodified portion. Since it was in close contact with layer 5, no separation, cracking or chipping occurred during element separation by dicing and scribing.
- the sapphire substrate is subjected to the modification process in a stripe shape on the plane, but the modification process may be partially applied to the sapphire substrate.
- the surface may be subjected to the modification treatment in the form of dots, stripes, grids, or other islands.
- M0CVD Metalorganic vapor phase epitaxy
- M0VPE molecular beam vapor phase epitaxy
- Halide VPE halide vapor phase epitaxy
- LPE liquid A phase growth method
- the thickness of the buffer layer formed by sputtering is not particularly limited, but is preferably 5 to 300 nm. More preferably, it is 10 to 120 nm, most preferably 30 to 90 nm.
- the etching depth for modifying the surface of the sapphire substrate is not particularly limited, but is preferably 0.5 nm or more and the thickness of the A1N buffer layer 4 or less. More preferably, the thickness of the A1N buffer layer 4 is 1 Z 2 or less, most preferably 1 It is as follows.
- a part of the composition of the group III element can be replaced by boron (B), thallium (T1), or nitrogen (
- B boron
- T1 thallium
- the present invention can be applied substantially even if a part of the composition of N) is replaced with phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). Further, those elements may be doped to such an extent that they cannot be displayed in composition.
- n-type group III nitride compound semiconductor layer When forming an n-type group III nitride compound semiconductor layer, a group IV element or a group VI element such as Si, Ge, Se, Te, and C can be added as an n-type impurity. Further, as a p-type impurity, a group II element or a group IV element such as Zn, Mg, Be, Ca, Sr, and Ba can be added. A plurality of these may be doped, or an n-type impurity and a p-type impurity may be doped in the same layer.
- the etching mask for the surface modification of the sapphire A surface may be any as long as it can be removed without affecting the A1N buffer layer.
- Ni, Ti, a metal such as Al, silicon oxide (Si0 2), silicon nitride (Si 3 N 4), titanium oxide (TiO x), oxides such as zirconium oxide (ZrO x), nitrides, these multilayer A membrane can be used.
- These film formation methods are optional, in addition to vapor phase growth methods such as vapor deposition, sputtering, and CVD.
- a semiconductor element such as a FET or a light-emitting element can be formed on the entire group III nitride-based compound semiconductor having the above-described region where threading dislocation is suppressed, or on the whole or above the region where threading dislocation is suppressed.
- the light-emitting layer can be of a multiple quantum well structure (MQW), a single quantum well structure (SQW), a homostructure, a heterostructure, or a double heterostructure. Or: It may be formed by a pn junction or the like.
- the above-described group III nitride-based compound semiconductor having a region in which threading dislocation is suppressed can be used as a group III nitride-based compound semiconductor substrate by removing, for example, the sapphire substrate 1 and the A1N buffer layer 4. That is, a group III nitride-based compound semiconductor substrate can be obtained by removing substantially all except the group III nitride-based compound semiconductor grown vertically and horizontally in the epitaxial direction. On this, a group III nitride compound semiconductor which is the same as or different from the already formed group III nitride compound semiconductor is further laminated and formed. Thus, an in-group nitride-based compound semiconductor device can be obtained.
- the above-described group II nitride-based compound semiconductor substrate can be used as a substrate for forming a larger group II nitride-based compound semiconductor crystal.
- the removal method is optional in addition to the mechanochemical polishing.
- the sapphire substrate 1 and the A1N buffer layer 4 were not removed, and the group III nitride-based compound semiconductor formed in the present embodiment was replaced with a group III-based compound semiconductor which was the same as or different from the group III nitride-based compound semiconductor already formed.
- a group III nitride-based compound semiconductor device can be obtained by further laminating nitride-based compound semiconductors.
- a region having a small number of threading dislocations is formed by substrate processing, a region having a small number of threading dislocations is formed above a region having a large number of threading dislocations by using various lateral epitaxy growths proposed.
- Forming is also included in the present invention.
- a mask is formed in a region of a group III nitride-based compound semiconductor layer having a large number of threading dislocations, and a surface of a region with a small number of threading dislocations is not formed.
- a group II nitride-based compound semiconductor layer having a small number of threading dislocations as a whole can be obtained.
- the second lateral epitaxal growth above the high threading dislocation region is optional.
Description
Claims
Priority Applications (3)
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AU2003211437A AU2003211437A1 (en) | 2002-02-28 | 2003-02-24 | Process for producing group iii nitride compound semiconductor |
EP03707019A EP1479795A4 (en) | 2002-02-28 | 2003-02-24 | METHOD FOR PRODUCING A GROUP III NITRIDE COMPOUND SEMICONDUCTOR |
US10/505,948 US7128846B2 (en) | 2002-02-28 | 2003-02-24 | Process for producing group III nitride compound semiconductor |
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JP2002-55094 | 2002-02-28 | ||
JP2002055094A JP4092927B2 (ja) | 2002-02-28 | 2002-02-28 | Iii族窒化物系化合物半導体、iii族窒化物系化合物半導体素子及びiii族窒化物系化合物半導体基板の製造方法 |
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WO2003072856A1 true WO2003072856A1 (fr) | 2003-09-04 |
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PCT/JP2003/001990 WO2003072856A1 (fr) | 2002-02-28 | 2003-02-24 | Procede de production de semi-conducteur a base d'un compose nitrure du groupe iii |
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US (1) | US7128846B2 (ja) |
EP (1) | EP1479795A4 (ja) |
JP (1) | JP4092927B2 (ja) |
AU (1) | AU2003211437A1 (ja) |
TW (1) | TWI232596B (ja) |
WO (1) | WO2003072856A1 (ja) |
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US9028611B2 (en) | 2009-12-25 | 2015-05-12 | Toyoda Gosei Co., Ltd. | Method for producing group III nitride semiconductor |
CN103243389A (zh) * | 2012-02-08 | 2013-08-14 | 丰田合成株式会社 | 制造第III族氮化物半导体单晶的方法及制造GaN衬底的方法 |
US9567693B2 (en) | 2012-02-08 | 2017-02-14 | Toyoda Gosei Co., Ltd. | Method for producing a group III nitride semiconductor single crystal and method for producing a GaN substrate |
US9691610B2 (en) | 2013-06-07 | 2017-06-27 | Toyoda Gosei Co., Ltd | Method for producing a group III nitride semiconductor crystal and method for producing a GaN substrate |
US9153439B2 (en) | 2013-06-11 | 2015-10-06 | Toyoda Gosei Co., Ltd | Method for etching a group III nitride semiconductor, method for producing a group III nitride semiconductor crystal, and method for producing a GaN substrate |
Also Published As
Publication number | Publication date |
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TWI232596B (en) | 2005-05-11 |
EP1479795A1 (en) | 2004-11-24 |
JP2003252700A (ja) | 2003-09-10 |
AU2003211437A1 (en) | 2003-09-09 |
JP4092927B2 (ja) | 2008-05-28 |
US20050118825A1 (en) | 2005-06-02 |
TW200306019A (en) | 2003-11-01 |
EP1479795A4 (en) | 2006-12-20 |
US7128846B2 (en) | 2006-10-31 |
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