JP4913375B2 - 半導体素子の製造方法 - Google Patents
半導体素子の製造方法 Download PDFInfo
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- JP4913375B2 JP4913375B2 JP2005229426A JP2005229426A JP4913375B2 JP 4913375 B2 JP4913375 B2 JP 4913375B2 JP 2005229426 A JP2005229426 A JP 2005229426A JP 2005229426 A JP2005229426 A JP 2005229426A JP 4913375 B2 JP4913375 B2 JP 4913375B2
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- 238000002128 reflection high energy electron diffraction Methods 0.000 description 11
- 229910052738 indium Inorganic materials 0.000 description 9
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- 239000010937 tungsten Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 1
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Description
[1]珪素単結晶基板と、その基板の表面に設けた炭化珪素層と、その炭化珪素層に接して設けたIII族窒化物半導体接合層と、そのIII族窒化物半導体接合層上にIII族窒化物半導体からなる超格子構造層を備えた半導体素子であって、炭化珪素層は立方晶で格子定数が0.436nmを超え、0.460nm以下の、組成的に珪素を富裕に含む非化学量論的な組成の層であり、III族窒化物半導体接合層は、組成がAlXGaYInZN1−αMα(0≦X、Y、Z≦1、X+Y+Z=1、0≦α<1、Mは窒素以外の第V族元素である。)である、ことを特徴とする半導体素子。
[2]III族窒化物半導体からなる超格子構造層が、アルミニウム(Al)組成を相違する窒化アルミニウム・ガリウム(AlXGa1−XN:0≦X≦1)層を交互に積層した層である、ことを特徴とする[1]に記載の半導体素子。
[3]アルミニウム組成を相違する窒化アルミニウム・ガリウム層でアルミニウム組成を小とする層が、III族窒化物半導体接合層に接していることを特徴とする[2]に記載の半導体素子。
[4]III族窒化物半導体からなる超格子構造層が、ガリウム(Ga)組成を相違する窒化ガリウム・インジウム(GaQIn1−QN:0≦Q≦1)層を交互に積層した層である、ことを特徴とする[1]に記載の半導体素子
[5]ガリウム組成を相違する窒化ガリウム・インジウム層でガリウム組成を大とする層が、III族窒化物半導体接合層に接している、ことを特徴とする[4]に記載の半導体素子。
[6]III族窒化物半導体からなる超格子構造層が、膜厚が5モノレイヤー(ML)〜30MLの範囲内である、ことを特徴とする[1]乃至[5]の何れか1項に記載の半導体素子。
[7]珪素単結晶基板が、表面を{111}結晶面とする基板であり、III族窒化物半導体接合層が、六方晶のウルツ鉱結晶型窒化アルミニウム(AlN)層である、ことを特徴とする[1]乃至[6]の何れか1項に記載の半導体素子。
[8]珪素単結晶基板が、表面を{001}結晶面とする基板であり、III族窒化物半導体接合層が、立方晶の閃亜鉛鉱結晶型窒化アルミニウム(AlN)層である、ことを特徴とする[1]乃至[6]の何れか1項に記載の半導体素子。
[9](1)珪素単結晶基板の表面に炭化水素ガスを吹き付けて、基板の表面に炭化水素を吸着させる工程と、(2)吸着させた温度以上の温度に珪素単結晶基板を加熱して、珪素単結晶基板の表面に格子定数を0.436nmを超え、0.460nm以下とする組成的に珪素を富裕に含む非化学量論的な組成の立方晶の炭化珪素層を形成する工程と、(3)炭化珪素層の表面に、第V族元素を含む気体と、第III族元素を含む気体を供給して、III族窒化物半導体接合層を形成する工程と、(4)III族窒化物半導体接合層上に、III族窒化物半導体からなる超格子構造層を形成する工程とを、この順で含むことを特徴とする半導体素子の製造方法。
[10]珪素単結晶基板を、表面を{111}結晶面とする基板とし、基板表面に形成する炭化珪素層を、表面を{111}結晶面とする層とし、III族窒化物半導体接合層を、六方晶の層とし、III族窒化物半導体からなる超格子構造層を、六方晶の層とする、ことを特徴とする請求項9に記載の半導体素子の製造方法。
[11]珪素単結晶基板を、表面を{001}結晶面とする基板とし、基板表面に形成する炭化珪素層を、表面を{001}結晶面とする層とし、III族窒化物半導体接合層を、立方晶の層とし、III族窒化物半導体からなる超格子構造層を、立方晶の層とする、ことを特徴とする請求項9に記載の半導体素子の製造方法。
[12](3)の工程において、炭化珪素層の表面に、第III族元素を含む気体としてアルミニウムを含む気体と、第V族元素を含む気体として窒素を含む原料とを供給して、窒化アルミニウムからなるIII族窒化物半導体接合層を形成する、ことを特徴とする[9]乃至[11]の何れか1項に記載の半導体素子の製造方法。
[13](3)の工程を、(3a)炭化珪素層の表面に、第III族元素を含む気体を供給して第III族元素を含む層を形成する工程と、(3b)第III族元素を含む層を窒化してIII族窒化物半導体接合層として第III族元素の窒化層を形成する工程とする、ことを特徴とする[9]乃至[12]の何れか1項に記載の半導体素子の製造方法。
[14](3a)の工程において、炭化珪素層の表面に、第III族元素を含む気体としてアルミニウムを含む気体を供給してアルミニウム層を形成することを特徴とする[13]に記載の半導体素子の製造方法。
[15](1)の工程を、(1a)珪素単結晶基板の表面に炭化水素ガスを吹き付けると共に、電子を照射して基板の表面に炭化水素を吸着させる工程とする、ことを特徴とする[9]乃至[14]の何れか1項に記載の半導体素子の製造方法。
[16](1)および(2)の工程を、(1b)珪素単結晶基板の表面に、炭化水素を吸着させた後、電子を照射しつつ、炭化水素を吸着させた温度以上の温度に珪素単結晶基板を加熱して、珪素単結晶基板の表面に格子定数が0.436nmを超え、0.460nm以下とする組成的に珪素を富裕に含む非化学量論的な組成の立方晶の炭化珪素層を形成する工程とする、ことを特徴とする[9]乃至[14]の何れか1項に記載の半導体素子の製造方法。
本実施例1では、(111)結晶面を表面とする(111)珪素単結晶基板に設けた非化学量論的な組成の炭化珪素層、六方晶のIII族窒化物半導体接合層、六方晶のIII族窒化物半導体層からなる超格子構造層とを含むエピタキシャル積層構造体から発光ダイオード(LED)を作製する場合を例にして、本発明を具体的に説明する。
(実施例2)
本実施例1では、(001)結晶面を表面とする(001)珪素単結晶基板に設けた非化学量論的な組成の炭化珪素層、立方晶のIII族窒化物半導体接合層、立方晶のIII族窒化物半導体層からなる超格子構造層とを含むエピタキシャル積層構造体から発光ダイオード(LED)を作製する場合を例にして、本発明を具体的に説明する。
(実施例3)
金属アルミニウム膜を窒化することにより形成した窒化アルミニウムからなるIII族窒化物半導体接合層を備えたLEDを構成する場合を例にして、本発明の内容を具体的に説明する。
11 LED用積層構造体
101 珪素単結晶基板
102 非化学量論的な組成の炭化珪素層
103 III族窒化物半導体接合層(AlN層)
104 III族窒化物半導体超格子構造層
105 III族窒化物半導体下部クラッド層
106 III族窒化物半導体発光層
107 III族窒化物半導体上部クラッド層
108 III族窒化物半導体コンタクト層
109 p形オーミック電極
110 n形オーミック電極
20 LED
21 LED用積層構造体
201 珪素単結晶基板
202 非化学量論的な組成の炭化珪素層
203 III族窒化物半導体接合層(AlN層)
204 III族窒化物半導体超格子構造層
205 III族窒化物半導体下部クラッド層
206 III族窒化物半導体発光層
207 III族窒化物半導体上部クラッド層
208 III族窒化物半導体コンタクト層
209 p形オーミック電極
210 n形オーミック電極
Claims (8)
- (1)珪素単結晶基板の表面に炭化水素ガスを吹き付けて、基板の表面に炭化水素を吸着させる工程と、(2)吸着させた温度以上の温度に珪素単結晶基板を加熱して、珪素単結晶基板の表面に格子定数を0.436nmを超え、0.460nm以下とする組成的に珪素を富裕に含む非化学量論的な組成の立方晶の炭化珪素層を形成する工程と、(3)炭化珪素層の表面に、第V族元素を含む気体と、第III族元素を含む気体を供給して、III族窒化物半導体接合層を形成する工程と、(4)III族窒化物半導体接合層上に、III族窒化物半導体からなる超格子構造層を形成する工程とを、この順で含むことを特徴とする半導体素子の製造方法。
- 珪素単結晶基板を、表面を{111}結晶面とする基板とし、基板表面に形成する炭化珪素層を、表面を{111}結晶面とする層とし、III族窒化物半導体接合層を、六方晶の層とし、III族窒化物半導体からなる超格子構造層を、六方晶の層とする、ことを特徴とする請求項1に記載の半導体素子の製造方法。
- 珪素単結晶基板を、表面を{001}結晶面とする基板とし、基板表面に形成する炭化珪素層を、表面を{001}結晶面とする層とし、III族窒化物半導体接合層を、立方晶の層とし、III族窒化物半導体からなる超格子構造層を、立方晶の層とする、ことを特徴とする請求項1に記載の半導体素子の製造方法。
- 上記(3)の工程において、炭化珪素層の表面に、第III族元素を含む気体としてアルミニウムを含む気体と、第V族元素を含む気体として窒素を含む原料とを供給して、窒化アルミニウムからなるIII族窒化物半導体接合層を形成する、ことを特徴とする請求項1乃至3の何れか1項に記載の半導体素子の製造方法。
- 上記(3)の工程を、(3a)炭化珪素層の表面に、第III族元素を含む気体を供給して第III族元素を含む層を形成する工程と、(3b)第III族元素を含む層を窒化してIII族窒化物半導体接合層として第III族元素の窒化層を形成する工程とする、ことを特徴とする請求項1乃至4の何れか1項に記載の半導体素子の製造方法。
- 上記(3a)の工程において、炭化珪素層の表面に、第III族元素を含む気体としてアルミニウムを含む気体を供給してアルミニウム層を形成することを特徴とする請求項5に記載の半導体素子の製造方法。
- 上記(1)の工程を、(1a)珪素単結晶基板の表面に炭化水素ガスを吹き付けると共に、電子を照射して基板の表面に炭化水素を吸着させる工程とする、ことを特徴とする請求項1乃至6の何れか1項に記載の半導体素子の製造方法。
- 上記(1)および(2)の工程を、(1b)珪素単結晶基板の表面に、炭化水素を吸着させた後、電子を照射しつつ、炭化水素を吸着させた温度以上の温度に珪素単結晶基板を加熱して、珪素単結晶基板の表面に格子定数が0.436nmを超え、0.460nm以下とする組成的に珪素を富裕に含む非化学量論的な組成の立方晶の炭化珪素層を形成する工程とする、ことを特徴とする請求項1乃至6の何れか1項に記載の半導体素子の製造方法。
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TW574762B (en) | 2002-10-16 | 2004-02-01 | Univ Nat Cheng Kung | Method for growing monocrystal GaN on silicon substrate |
WO2006057485A1 (en) * | 2004-11-29 | 2006-06-01 | Epivalley Co., Ltd. | Iii-nitride semiconductor light emitting device |
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2005
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JP2007048817A (ja) | 2007-02-22 |
US20120007050A1 (en) | 2012-01-12 |
US20090127583A1 (en) | 2009-05-21 |
TW200715617A (en) | 2007-04-16 |
TWI316769B (en) | 2009-11-01 |
US8222674B2 (en) | 2012-07-17 |
KR20080037697A (ko) | 2008-04-30 |
US8043977B2 (en) | 2011-10-25 |
WO2007018299A1 (ja) | 2007-02-15 |
KR101000375B1 (ko) | 2010-12-13 |
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