JP7290156B2 - 窒化物半導体基板及びその製造方法 - Google Patents
窒化物半導体基板及びその製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 146
- 239000004065 semiconductor Substances 0.000 title claims description 67
- 150000004767 nitrides Chemical class 0.000 title claims description 62
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 94
- 239000010408 film Substances 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 26
- 239000010409 thin film Substances 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 14
- 229910002704 AlGaN Inorganic materials 0.000 claims description 13
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 claims 1
- 239000010410 layer Substances 0.000 description 80
- 230000015572 biosynthetic process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 7
- 208000032544 Cicatrix Diseases 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 231100000241 scar Toxicity 0.000 description 5
- 230000037387 scars Effects 0.000 description 5
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 238000005468 ion implantation Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Description
少なくとも支持基板と、貼り合わせ用単結晶シリコン基板を準備する工程、
前記支持基板と前記貼り合わせ用単結晶シリコン基板を酸化シリコン層を介して接合する工程、
前記貼り合わせ用単結晶シリコン基板を薄膜化し単結晶シリコン層に加工する工程、
前記単結晶シリコン層の端部から内方を覆うようにリング状部材を載置する工程、
前記単結晶シリコン層上にAlN膜を成長させる工程、
AlN膜上にGaN膜またはAlGaN膜、またはその両方を成長させる工程を含むことを特徴とする窒化物半導体基板の製造方法を提供する。
また、本発明は、窒化物半導体基板の製造方法であって、
少なくとも支持基板と、貼り合わせ用単結晶シリコン基板を準備する工程、
前記支持基板と前記貼り合わせ用単結晶シリコン基板を酸化シリコン層を介して接合する工程、
前記貼り合わせ用単結晶シリコン基板を薄膜化し単結晶シリコン層に加工する工程、
前記単結晶シリコン層の端部から内方を覆うようにリング状部材を載置する工程、
前記単結晶シリコン層上にAlN膜を成長させる工程、
AlN膜上にGaN膜またはAlGaN膜、またはその両方を成長させる工程を含む窒化物半導体基板の製造方法である。
本発明の窒化物半導体基板の構成は、図3のように支持基板11上に絶縁層12を介して単結晶シリコン層13が形成された成膜用基板10上に、Gaを含む窒化物半導体薄膜が成膜されている窒化物半導体基板である。そして図1のように、前記窒化物半導体薄膜14の成長面である前記単結晶シリコン層13の端部から内方に向けてGaを含む前記窒化物半導体薄膜14が成膜されていない領域Aを有するものである。
本発明の窒化物半導体基板の製造方法は、
少なくとも支持基板と、貼り合わせ用単結晶シリコン基板を準備する工程、
前記支持基板と前記貼り合わせ用単結晶シリコン基板を酸化シリコン層を介して接合する工程、
前記貼り合わせ用単結晶シリコン基板を薄膜化し単結晶シリコン層に加工する工程、
前記単結晶シリコン層の端部から内方を覆うようにリング状部材を載置する工程、
前記単結晶シリコン層上にAlN膜を成長させる工程、
AlN膜上にGaN膜またはAlGaN膜、またはその両方を成長させる工程を含んでいれば特に限定されない。
図2に示すMOCVD装置のサテライト2に直径150mmの単結晶シリコン基板からなる支持基板11に酸化シリコン層12を介して単結晶シリコン層13が形成された成膜用基板10をセットし、成長用基板の単結晶シリコン層13の端部から0.3mmの領域を覆うようにSiCからなるリング状部材6を成膜用基板上に載置した。
その上に厚さ100nmのAlN膜を成長させた。その後、AlGaN膜を150nm成長させた。その上にGaN膜を成長して、エピタキシャル層の合計の総膜厚は5μmとした。エピタキシャル成長終了後、GaN膜をエピタキシャル成長させた成膜用基板の単結晶シリコン層端部周辺を光学顕微鏡で観察し、反応痕の発生状態を調査した。その結果を図5に示す。図5に示すように反応痕の発生はなかった。
リング状部材を載置しないことを除き、実施例と同様の条件でエピタキシャル成長を行った。実施例同様に外周部の反応痕の発生状態を調査した。その結果を図6に示す。図6に示すように反応痕が発生しているのが確認できる。
3…シーリング、 4…クォーツ、 5…ガス流、 6…リング状部材、
10…成膜用基板、 11…支持基板、 12…絶縁層、
13…単結晶シリコン層、 14…窒化物半導体薄膜、
A…窒化物半導体薄膜が成膜されていない領域。
Claims (6)
- 支持基板上に絶縁層を介して単結晶シリコン層が形成された成膜用基板上に、Gaを含む窒化物半導体薄膜が成膜されている窒化物半導体基板であって、前記窒化物半導体薄膜の成長面である前記単結晶シリコン層の端部から内方に向けてGaを含む前記窒化物半導体薄膜が成膜されていない領域を有し、前記成膜されていない領域が、単結晶シリコン層の端部から内方に向けて0.3mm以上3mm未満の領域であることを特徴とする窒化物半導体基板。
- 前記絶縁層が、酸化シリコン(SiO2)層であることを特徴とする請求項1または請求項1に記載の窒化物半導体基板。
- 前記成膜用基板上に成膜されている窒化物半導体薄膜は、AlN膜とその上にGaN膜またはAlGaN膜、またはその両方が形成されているものであることを特徴とする請求項1又は請求項2に記載の窒化物半導体基板。
- 前記成膜用基板が多結晶シリコンまたは単結晶シリコンを支持基板として、その上に酸化シリコン層を介して単結晶シリコン層が貼り合わされたものであることを特徴とする請求項1から請求項3のいずれか一項に記載の窒化物半導体基板。
- 窒化物半導体基板の製造方法であって、
少なくとも支持基板と、貼り合わせ用単結晶シリコン基板を準備する工程、
前記支持基板と前記貼り合わせ用単結晶シリコン基板を酸化シリコン層を介して接合する工程、
前記貼り合わせ用単結晶シリコン基板を薄膜化し単結晶シリコン層に加工する工程、
前記単結晶シリコン層の端部から内方を0.3mm以上3mm未満の領域を覆うようにリング状部材を載置する工程、
前記単結晶シリコン層上にAlN膜を成長させる工程、
AlN膜上にGaN膜またはAlGaN膜、またはその両方を成長させる工程を含むことを特徴とする窒化物半導体基板の製造方法。 - 前記支持基板を、多結晶シリコンまたは単結晶シリコンからなる支持基板とすることを特徴とする請求項5に記載の窒化物半導体基板の製造方法。
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US20190390365A1 (en) | 2018-06-22 | 2019-12-26 | X-Fab Semiconductor Foundries Gmbh | Substrates for iii-nitride epitaxy |
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