JP2005112641A - 窒化物半導体基板および窒化物半導体基板の製造方法 - Google Patents
窒化物半導体基板および窒化物半導体基板の製造方法 Download PDFInfo
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- 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
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
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- 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
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Abstract
【課題】 転位密度の低いGaN薄膜、InGaN薄膜、AlGaN薄膜などの窒化物系半導体薄膜をエピ成長させることができ、低コストの窒化物半導体基板を提供すること。
【解決手段】 C面を表面に有する窒化物半導体基板の表面をラッピングによって面粗度をRms5nm〜200nmに仕上げるようにした。ラッピング時間が大幅に低減され低コストになる。面粗度が大きくて数多くの凹部を含み、凹部から斜め成長する結晶が転位を面と面の境界へ集め、境界から凹部の底へ移動させることによって転位を凹部底へ集結させることによってエピ成長層の転位密度を減少させる。
基板の面粗度が大きいからエピ成長層のモーフォロジーは悪いが、転位密度は低くなる。デバイス特性に大きく影響する転位密度を減らすことができ低コストで有用な基板となる。
【選択図】 図1
Description
図1は実施例1のGaN基板の表面の顕微鏡写真と、X方向に高さを走査した走査線の群を二次元的に表示した斜視図と、あるyの値で切った面での高さ変動を示す一次元グラフである。GaNウエハ自体は2インチ直径(50mmφ)であるが、顕微鏡写真はその一部のx方向に130μm、y方向に100μmの矩形領域を示す。
図2は実施例2のGaN基板の表面の顕微鏡写真と、X方向に高さを走査した走査線の群を二次元的に表示した斜視図と、あるyの値で切った面での高さ変動を示す一次元グラフである。顕微鏡写真はウエハの一部のx方向に130μm、y方向に100μmの矩形領域を示す。矩形領域での平均の面粗度Rms=136.884nm、Ra=103.057nmである。これは本発明のRmsの範囲5nm〜200nmに含まれる範囲である。矩形領域でのRms/Ra比は約1.3である。あるyの値の線で切った一次元の面粗度はRms119.749nm、Ra73.152nmである。その一次元面粗度においてRms/Ra比は1.6である。
図3は実施例3のGaN基板の表面の顕微鏡写真と、X方向に高さを走査した走査線の群を二次元的に表示した斜視図と、あるyの値で切った面での高さ変動を示す一次元グラフである。顕微鏡写真はウエハの一部のx方向に130μm、y方向に100μmの矩形領域を示す。矩形領域での平均の面粗度Rms=117.944nm、Ra=53.598nmである。これは本発明のRmsの範囲5nm〜200nmに含まれる範囲である。矩形領域でのRms/Ra比は約2.2である。
図4は実施例4のGaN基板の表面の顕微鏡写真と、X方向に高さを走査した走査線の群を二次元的に表示した斜視図と、あるyの値で切った面での高さ変動を示す一次元グラフである。顕微鏡写真はウエハの一部のx方向に130μm、y方向に100μmの矩形領域を示す。矩形領域での平均の面粗度Rms=23.709nm、Ra=9.494nmである。これは本発明のRmsの範囲5nm〜200nmに含まれる範囲である。矩形領域でのRms/Ra比は約2.4である。
図5は比較例5のGaN基板の表面の顕微鏡写真と、X方向に高さを走査した走査線の群を二次元的に表示した斜視図と、あるyの値で切った面での高さ変動を示す一次元グラフである。顕微鏡写真はウエハの一部のx方向に130μm、y方向に100μmの矩形領域を示す。矩形領域での平均の面粗度Rms=2.034nm、Ra=1.610nmである。これは本発明のRmsの範囲5nm〜200nmに含まれない。下限の5nmより小さい。矩形領域でのRms/Ra比は約1.3である。あるyの値の線で切った一次元の面粗度はRms1.694nm、Ra1.344nmである。その一次元面粗度においてRms/Ra比は1.3である。穴の深さが減っているし孤立穴というよりも隣接穴と山が融合しており、きれいなファセット面からなる穴ができていない。
Claims (7)
- 表面の面粗度がRms5nm〜200nmであることを特徴とする窒化物半導体基板。
- 表面の面粗度がRms50nm〜200nmであることを特徴とする窒化物半導体基板。
- 遊離砥粒もしくは固定砥粒によるラッピング(研削)により、表面の面粗度がRms5nm〜200nmに仕上げたことを特徴とする窒化物半導体基板。
- 転位密度が105cm−2〜109cm−2であって、遊離砥粒もしくは固定砥粒によるラッピング(研削)により表面の面粗度がRms5nm〜200nmに仕上げたことを特徴とする窒化物半導体基板。
- ラッピング後にラッピング加工表面をドライエッチングもしくはウエットエッチングすることにより加工変質層を除去したことを特徴とする請求項4に記載の窒化物半導体基板。
- HVPE法あるいはMOC法でGaAs下地基板の上に窒化物半導体結晶膜を形成し、GaAs下地基盤を除去して窒化物半導体自立膜とし、遊離砥粒もしくは固定砥粒によるラッピング(研削)により、表面の面粗度Rmsを5nm〜200nmとすることを特徴とする窒化物半導体基板の製造方法。
- 砥粒サイズを段階的に小さくしていって窒化物半導体基板をラッピング(研削)する工程で、最終のラッピング(研削)砥粒の平均粒径が1μm〜5μmである事を特徴とする請求項6に記載の窒化物半導体基板の製造方法。
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JP2003345910A JP2005112641A (ja) | 2003-10-03 | 2003-10-03 | 窒化物半導体基板および窒化物半導体基板の製造方法 |
TW093121516A TWI305061B (en) | 2003-10-03 | 2004-07-19 | Nitride semiconductor substrate and method of producing same |
KR1020040067462A KR20050033422A (ko) | 2003-10-03 | 2004-08-26 | 질화물 반도체 기판 및 질화물 반도체 기판의 제조 방법 |
EP04021388A EP1521310A3 (en) | 2003-10-03 | 2004-09-08 | Nitride semiconductor substrate and method of producing same |
CA002480837A CA2480837A1 (en) | 2003-10-03 | 2004-09-09 | Nitride semiconductor substrate and method of producing same |
CNB2004100118527A CN100361323C (zh) | 2003-10-03 | 2004-09-22 | 氮化物半导体衬底和氮化物半导体衬底的制造方法 |
US10/954,186 US7154131B2 (en) | 2003-10-03 | 2004-10-01 | Nitride semiconductor substrate and method of producing same |
NO20044180A NO20044180L (no) | 2003-10-03 | 2004-10-04 | Nitrid halvledersubstrat og fremgangsmate for a fremstille dette |
HK05107082A HK1073532A1 (en) | 2003-10-03 | 2005-08-16 | Nitride semiconductor substrate and method of producting same |
US11/262,823 US7390747B2 (en) | 2003-10-03 | 2005-11-01 | Nitride semiconductor substrate and method of producing same |
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Cited By (7)
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JP2007095975A (ja) * | 2005-09-29 | 2007-04-12 | National Institute Of Advanced Industrial & Technology | ダイヤモンドパワー半導体デバイス及びその製造方法 |
WO2009096125A1 (ja) * | 2008-01-28 | 2009-08-06 | Sumitomo Electric Industries, Ltd. | Iii族窒化物単結晶インゴット、iii族窒化物単結晶基板、iii族窒化物単結晶インゴットの製造方法、及びiii族窒化物単結晶基板の製造方法 |
JP2011077381A (ja) * | 2009-09-30 | 2011-04-14 | Sumitomo Electric Ind Ltd | Iii族窒化物半導体基板、エピタキシャル基板及び半導体デバイス |
JP2013032278A (ja) * | 2008-09-08 | 2013-02-14 | Sumitomo Electric Ind Ltd | 基板の製造方法 |
US8853670B2 (en) | 2009-09-30 | 2014-10-07 | Sumitomo Electric Industries, Ltd. | III nitride semiconductor substrate, epitaxial substrate, and semiconductor device |
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US7504274B2 (en) | 2004-05-10 | 2009-03-17 | The Regents Of The University Of California | Fabrication of nonpolar indium gallium nitride thin films, heterostructures and devices by metalorganic chemical vapor deposition |
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WO2007145873A2 (en) * | 2006-06-05 | 2007-12-21 | Cohen Philip I | Growth of low dislocation density group-iii nitrides and related thin-film structures |
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TW201029073A (en) * | 2009-01-21 | 2010-08-01 | Univ Nat Chunghsing | Epitaxial wafer with low surface defect density |
JP5808208B2 (ja) * | 2011-09-15 | 2015-11-10 | 株式会社サイオクス | 窒化物半導体基板の製造方法 |
US11370076B2 (en) * | 2016-02-23 | 2022-06-28 | Panasonic Intellectual Property Management Co., Ltd. | RAMO4 substrate and manufacturing method thereof |
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JP3899652B2 (ja) | 1997-03-14 | 2007-03-28 | 住友電気工業株式会社 | エピタキシャルウェハ |
JP3788037B2 (ja) | 1998-06-18 | 2006-06-21 | 住友電気工業株式会社 | GaN単結晶基板 |
JP4008586B2 (ja) * | 1998-08-09 | 2007-11-14 | エムテック株式会社 | ワークのエッジの研摩装置 |
JP4145437B2 (ja) | 1999-09-28 | 2008-09-03 | 住友電気工業株式会社 | 単結晶GaNの結晶成長方法及び単結晶GaN基板の製造方法と単結晶GaN基板 |
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JP2001322899A (ja) | 2000-05-11 | 2001-11-20 | Matsushita Electric Ind Co Ltd | 窒化ガリウム系化合物半導体基板及びその製造方法 |
JP4156200B2 (ja) * | 2001-01-09 | 2008-09-24 | 株式会社荏原製作所 | 研磨装置及び研磨方法 |
JP2002356398A (ja) * | 2001-06-01 | 2002-12-13 | Sumitomo Electric Ind Ltd | 窒化ガリウムウエハ |
US6488767B1 (en) * | 2001-06-08 | 2002-12-03 | Advanced Technology Materials, Inc. | High surface quality GaN wafer and method of fabricating same |
KR100550491B1 (ko) * | 2003-05-06 | 2006-02-09 | 스미토모덴키고교가부시키가이샤 | 질화물 반도체 기판 및 질화물 반도체 기판의 가공 방법 |
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- 2004-09-22 CN CNB2004100118527A patent/CN100361323C/zh not_active Expired - Fee Related
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Cited By (12)
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JP2007095975A (ja) * | 2005-09-29 | 2007-04-12 | National Institute Of Advanced Industrial & Technology | ダイヤモンドパワー半導体デバイス及びその製造方法 |
WO2009096125A1 (ja) * | 2008-01-28 | 2009-08-06 | Sumitomo Electric Industries, Ltd. | Iii族窒化物単結晶インゴット、iii族窒化物単結晶基板、iii族窒化物単結晶インゴットの製造方法、及びiii族窒化物単結晶基板の製造方法 |
US8845992B2 (en) | 2008-01-28 | 2014-09-30 | Sumitomo Electric Industries, Ltd. | III-nitride single-crystal ingot, III-nitride single-crystal substrate, method of manufacturing III-nitride single-crystal ingot, and method of manufacturing III-nitride single-crystal substrate |
JP2013032278A (ja) * | 2008-09-08 | 2013-02-14 | Sumitomo Electric Ind Ltd | 基板の製造方法 |
JP2011077381A (ja) * | 2009-09-30 | 2011-04-14 | Sumitomo Electric Ind Ltd | Iii族窒化物半導体基板、エピタキシャル基板及び半導体デバイス |
US8853670B2 (en) | 2009-09-30 | 2014-10-07 | Sumitomo Electric Industries, Ltd. | III nitride semiconductor substrate, epitaxial substrate, and semiconductor device |
US8952494B2 (en) | 2009-09-30 | 2015-02-10 | Sumitomo Electric Industries, Ltd. | Group III nitride semiconductor substrate having a sulfide in a surface layer |
US9070828B2 (en) | 2009-09-30 | 2015-06-30 | Sumitomo Electric Industries, Ltd. | III nitride semiconductor substrate, epitaxial substrate, and semiconductor device |
US9299890B2 (en) | 2009-09-30 | 2016-03-29 | Sumitomo Electric Industries, Ltd. | III nitride semiconductor substrate, epitaxial substrate, and semiconductor device |
JP2015159334A (ja) * | 2015-05-25 | 2015-09-03 | 株式会社サイオクス | 窒化物半導体基板の製造方法 |
JP2020019675A (ja) * | 2018-07-31 | 2020-02-06 | 株式会社サイオクス | 窒化物結晶部材とその製造方法、および、積層窒化物結晶基板とその製造方法 |
JP7231352B2 (ja) | 2018-07-31 | 2023-03-01 | 住友化学株式会社 | 窒化物結晶成長用基板の製造方法 |
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EP1521310A3 (en) | 2011-01-26 |
CN1604344A (zh) | 2005-04-06 |
TW200520259A (en) | 2005-06-16 |
US7390747B2 (en) | 2008-06-24 |
US20060071234A1 (en) | 2006-04-06 |
US20050073027A1 (en) | 2005-04-07 |
NO20044180L (no) | 2005-04-04 |
CN100361323C (zh) | 2008-01-09 |
KR20050033422A (ko) | 2005-04-12 |
TWI305061B (en) | 2009-01-01 |
EP1521310A2 (en) | 2005-04-06 |
CA2480837A1 (en) | 2005-04-03 |
HK1073532A1 (en) | 2005-10-07 |
US7154131B2 (en) | 2006-12-26 |
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