JP4522301B2 - 半導体基板および半導体装置 - Google Patents
半導体基板および半導体装置 Download PDFInfo
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- JP4522301B2 JP4522301B2 JP2005100248A JP2005100248A JP4522301B2 JP 4522301 B2 JP4522301 B2 JP 4522301B2 JP 2005100248 A JP2005100248 A JP 2005100248A JP 2005100248 A JP2005100248 A JP 2005100248A JP 4522301 B2 JP4522301 B2 JP 4522301B2
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- 239000004065 semiconductor Substances 0.000 title claims description 270
- 239000000758 substrate Substances 0.000 title claims description 231
- 239000013078 crystal Substances 0.000 claims description 117
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052594 sapphire Inorganic materials 0.000 claims description 7
- 239000010980 sapphire Substances 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 29
- 230000003287 optical effect Effects 0.000 description 26
- 238000005253 cladding Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 11
- 230000001681 protective effect Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 238000004544 sputter deposition Methods 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 6
- 229910002704 AlGaN Inorganic materials 0.000 description 5
- 238000001459 lithography Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910052733 gallium Inorganic materials 0.000 description 4
- 229910052738 indium Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 229910004541 SiN Inorganic materials 0.000 description 1
- 229910008599 TiW Inorganic materials 0.000 description 1
- 229910008812 WSi Inorganic materials 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 diameter Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Description
図1は、第1の実施の形態に係る半導体基板100の模式的断面図である。図1に示すように、半導体基板100は、成長基板1、半導体結晶層2、応力緩和層3を備える。成長基板1は、基板として半導体ウェハの基板として機能するものであり、GaN,SiC,サファイア等の基板からなる。
第1の実施の形態においては成長基板1上に半導体結晶層2を形成した後に応力緩和層3を設けているが、あらかじめ応力を成長基板1に付与することにより、後に半導体結晶層2を成長させた場合にトータルで反り量を低減することも可能である。すなわち、本発明は、半導体結晶層2を成長させる前にあらかじめ反対の応力を付与した半導体結晶成長用基板においても、その効果を発揮できるものである。
第1および第2の実施の形態において説明したような応力緩和層は、半導体装置の製造工程におけるリソグラフィ工程だけに効果を発揮するものではない。例えば、ダイシングなどによってチップ状の半導体装置に分割された後も、生じる反りが緩和される。その結果、半導体装置の特性劣化を防止することができる。以下、応力緩和層が設けられた半導体装置について説明する。半導体装置の一例としてGaN系HEMTについて説明する。
次に、光半導体装置の一例としてGaN系VCSELについて説明する。図11は、第4の実施の形態に係る光半導体装置400の模式的断面図である(GaN系VCSEL)。図11に示すように、光半導体装置400は、基板401上にバッファ層402およびn型コンタクト層403が順に形成されている。また、n型コンタクト層403の中央部上にn型クラッド層404、量子井戸活性層405、p型クラッド層406およびp型コンタクト層407が順に形成されている。
比較例1として従来の半導体基板500を作製した。図16は、従来の半導体基板500の模式的断面図である。図16に示すように、SiCから構成される成長基板501上にMOCVD法により、Al,Ga,InおよびNからなる半導体結晶層502をエピタキシャル成長させた。
実施例1として上記実施の形態に従って図1の半導体基板100を作製した。成長基板1としてSiCを用い、半導体結晶層2としてAl,Ga,InおよびNからなる結晶層を用い、応力緩和層3としてSiO2を用いた。半導体結晶層2はMOCVD法により成長基板1上にエピタキシャル成長させ、応力緩和層3は成長基板1の下面、成長基板1の側面および半導体結晶層2の側面にスパッタリングにより形成した。
比較例1に係る半導体基板200および実施例1に係る半導体基板100の反り量を表2に示す。表2に示すように、比較例1に係る半導体基板500の反り量は、半導体結晶層501をエピタキシャル成長させる前においては12μmとなり、半導体結晶層501をエピタキシャル成長させた後においては17μmとなった。一方、実施例1に係る半導体基板100においては、応力緩和層3を形成した後の反り量は5μmとなった。以上のことから、実施例1に係る半導体基板100においては半導体結晶層2から成長基板1に対してかかる応力が相殺されていることがわかる。
続いて、比較例2として従来の半導体基板500aを作製した。図17は、従来の半導体基板500aの模式的断面図である。図17に示すように、SiCから構成される成長基板501上にAl,Ga,InおよびNからなる半導体結晶層502をMOCVD法によりエピタキシャル成長させ、成長基板501の下面にスパッタリングにより応力緩和層503を形成した。
実施例1に係る半導体基板100および比較例2に係る半導体基板200aを用いてトランジスタを作製する工程中に、成長基板と応力緩和層との間に剥がれが生じるか否かを調べた。実施例1に係る半導体基板100および比較例2に係る半導体基板200aのサンプルをそれぞれ50個ずつ作製した。これらを用いてトランジスタを作製した。表3にその結果を示す。
2 半導体結晶層
3,202,320,420 応力緩和層
100 半導体基板
200 半導体結晶成長用基板
300,300a,400,400a 半導体装置
311,421 溝
Claims (8)
- 基板の一面上に成長した半導体結晶層と、
前記基板の他面およびこれに連続して前記基板の側面および前記半導体結晶層の側面に形成され、前記基板に対し、前記半導体結晶層が前記基板に付与する応力と同じ方向に応力を付与する応力緩和層と、を備え、
前記半導体結晶層は、表面に前記応力緩和層が形成されない領域を有することを特徴とする半導体基板。 - 前記半導体結晶層は、GaN系半導体層であることを特徴とする請求項1記載の半導体基板。
- 前記基板は、GaN,SiCまたはサファイアであることを特徴とする請求項1または2記載の半導体基板。
- 前記応力緩和層は、SiN,WSi,TiW,TiNまたはGaNであることを特徴とする請求項1〜3のいずれかに記載の半導体基板。
- 基板の一面上に設けられた電界効果型トランジスタの動作層となる半導体結晶層と、
チップに分割された前記基板の他面およびこれに連続して前記基板の側面および前記半導体結晶層の側面に設けられ、前記基板に対し、前記半導体結晶層が前記基板に付与する応力と同じ方向に応力を付与する応力緩和層と、を備え、
前記半導体結晶層は、表面に前記応力緩和層が形成されない領域を有することを特徴とする半導体装置。 - 前記半導体結晶層は、GaN系半導体層であることを特徴とする請求項5記載の半導体装置。
- 前記基板は、GaN,SiCまたはサファイアであることを特徴とする請求項5または6記載の半導体装置。
- 前記応力緩和層は、SiN,WSi,TiW,TiNまたはGaNであることを特徴とする請求項5〜7のいずれかに記載の半導体装置。
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IT1406644B1 (it) | 2010-04-29 | 2014-03-07 | Abbondanza | Substrato (fetta) di materiale semiconduttore con sovrastanti strati eteroepitassiali assumenti una struttura sandwich, idoneo per la fabbricazione di componenti elettronici ibridi. |
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JP6171250B2 (ja) * | 2013-06-28 | 2017-08-02 | 住友電工デバイス・イノベーション株式会社 | 半導体装置 |
US8969109B1 (en) * | 2013-09-05 | 2015-03-03 | International Business Machines Corporation | Tunable light-emitting diode |
JP2015060920A (ja) * | 2013-09-18 | 2015-03-30 | 株式会社デンソー | 半導体装置およびその製造方法 |
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TWI648854B (zh) * | 2017-06-14 | 2019-01-21 | 穩懋半導體股份有限公司 | 用以減少化合物半導體晶圓變形之改良結構 |
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