JP4095066B2 - 窒化ガリウムベース半導体の半導体構造 - Google Patents
窒化ガリウムベース半導体の半導体構造 Download PDFInfo
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Description
本発明の関連態様は、シリコン基板と、基板の上に直接重なるアルミニウムの層と、アルミニウム層の上に直接重なる窒化物半導体の核生成層とを、核生成層の上に重なる1つ又はそれ以上の超格子を含むバッファ構造及びバッファ構造の上に重なる1つ又はそれ以上の窒化ガリウムベース半導体を含む作動構造と共に組み込んだ半導体構造を提供する。
本発明のこれらの態様は、シリコン基板に付随する電気的性能の限界は、成長後に基板を除去し、一般的にエピタキシャル成長には適さないと思われる異なるベース材料で置換することにより容易に解決することができるという認識を導入したものである。
窒化物半導体の層は、GaN又は別の窒化ガリウムベース半導体を含むことができる。シリコン基板と窒化物半導体の第1の層との間に、窒化物半導体の更なる層を配置することができ、窒化物半導体のこの更なる層は、窒化物半導体の第1の層よりも高いドーピング濃度を有することができる。この更なる層は、GaN又は別の窒化ガリウムベース半導体を含むこともできる。窒化物半導体の第1の層及び第1の金属層は、窒化物半導体の層の幅全体に亘って覆うことができる。代替的に、窒化物半導体の第1の層及び第1の金属層は、シリコン基板の一部分を覆う。
窒化物半導体の層は、GaN又は別の窒化ガリウムベース半導体を含むことができる。窒化物半導体の更なる層は、窒化物半導体の第1の層の形成前に形成してもよく、窒化物半導体の第1の層よりも高いドーピング濃度を有する。この更なる層は、GaN又は別の窒化ガリウムベース半導体を含むこともできる。窒化物半導体の第1の層に一部分は、窒化物半導体の層がメサ構造を形成するように除去することができる。
本発明の上記及び他の目的、特徴、及び利点は、添付図面と共に以下に示す好ましい実施形態の詳細説明から容易に更に明らかになるであろう。
第1の超格子18の堆積に続いて、有機ガリウム化合物、アンモニア、及び同伴ガスの混合物に基板を約950から約1100℃の温度で露出することにより、窒化ガリウムベース半導体、最も好ましくはGaNの薄い中間層24が堆積される。層24の厚さは、最も好ましくは、約200から約400ナノメートルである。
高品質化学蒸着に使用される従来の技術が次に行われるべきである。任意選択的に、例えば、アルミニウム層14とバッファ層16の堆積の間のような異なる組成を有する各層の堆積の間、及び、各超格子の堆積の前及び後の両方に、チャンバは、先行する層からの金属を水素又は窒素の同伴ガスとアンモニアとの混合物で長期間洗浄することにより取り除くことができる。
しかし、より好ましくは、基板10は除去される。本発明の更に別の実施形態(図3)による処理では、シリコン基板10と図1及び2に関して上述の窒化物構造と同じか又は異なっていてもよい窒化物構造36とを組み込んだ半導体構造は、一時的な担体42と係合し、それによって窒化物構造の上面38は、担体を支持し、窒化物構造の上面はまた、好ましくは上部窒化物層及び担体間の接着を促進する誘電性「接着剤」を用いることにより担体に結合される。この誘電体は、例えば、ベンゾシクロブタン(BCB)、メチルシルセスキオキサン(MSSQ)、又は、「Flare(登録商標)」、「SiLK(登録商標)」、「Parylene−N」、及び「PETI 5」という商品名の下で販売されているもののような材料とすることができる。窒化物構造、担体、又はその両方の表面は、接着剤でコーティングされ、次に、それらの表面は、400℃よりも低い比較的低い温度の下で接触した状態にされる。その後の処理段階が100℃を超えて行われる必要がない場合、「HMDS」又はフォトレジストのような他のポリマーを使用することができる。更に、アセトンのような溶剤がその後の処理段階にない場合、ワックス又は「Crystalbond(登録商標)」のような可溶性接着剤を使用することもできる。
図3及び4に関して上述した方法により作製された完成素子は、窒化物構造のエピタキシャル成長に使用されたシリコン基板が完成素子に存在しないので、優れた電気特性をもたらすことができる。例えばサファイアウェーハのような比較的高価な材料が一時的担体として使用されるが、これらは、リサイクルして再使用することができ、完成素子のどの部分も形成しない。
素子の底部には、薄いオーム金属接触層316がシリコン基板302の背面に形成され、別の金属スタック318が、オーム金属層316の上に堆積される。任意選択の保護層314は、ショットキー接触金属層310及び厚い金属層312の全て又は一部の上に形成することができる。
上記及び他の変形及び組合せを使用することができるので、好ましい実施形態の以上の説明は、特許請求の範囲で規定された本発明を制限するのではなく、例証的なものとして考えるべきである。
14 アルミニウムの単層
16 核生成層
18、26 多重超格子
24 中間層
32 バッファ構造
34 窒化物半導体
Claims (13)
- (a)シリコン基板と、
(b)該基板の上に直接重なるアルミニウムの層と、
(c)該アルミニウムの層の上に直接重なる窒化物半導体の多結晶核生成層と、
(d)該核生成層の直ぐ上にある第1の超格子と、該第1の超格子の上にある窒化物ベース半導体の中間層と、該中間層の上にあって複数の窒化物ベース半導体を含んだ第2の超格子と、を含むバッファ構造と、
を具備し、
前記第1の超格子が、異なった組成を有する複数の窒化物ベース半導体であって各々が式AlrGa(1-r)N(0<r<1)に従った組成を有する複数の窒化物ベース半導体を含み、
前記第2の超格子が、各々が式AlrGa(1-r)N(0<r<1)に従った組成を有する複数の半導体により本質的に構成されており、
さらに、
(e)前記バッファ構造の上にある1又はそれ以上の窒化ガリウムベース半導体の作動構造と、
を具備することを特徴とする半導体構造。 - 前記核生成層が、本質的に窒化アルミニウムにより構成されており、
前記第1の超格子が、本質的に、式AlrGa(1-r)N(0<r<1)に従った半導体により構成されている、請求項1に記載の半導体構造。 - 前記第1の超格子及び前記第2の超格子の各々が、異なるr値を有する2つの半導体のみにより構成されている、請求項1に記載の半導体構造。
- 前記第1の超格子に含まれた半導体が前記第2の超格子に含まれた半導体と同一である、請求項3に記載の半導体構造。
- 前記作動構造が、窒化物半導体の第1の層を含み、
該作動構造が、さらに、前記窒化物半導体の前記第1の層の上にあって該第1の層に対するショットキー接触を形成する少なくとも1つの第1の金属層を具備する、請求項1に記載の半導体構造。 - 前記窒化物半導体の前記第1の層が窒化ガリウムベース半導体を含む、請求項5に記載の半導体構造。
- 前記窒化物半導体の前記第1の層がGaNを含む、請求項5に記載の半導体構造。
- さらに、前記シリコン基板の別の表面の上にあって該基板に対するオーミック接触を形成する少なくとも1つの更なる金属層を具備する、請求項5に記載の半導体構造。
- 前記作動構造が、前記窒化物半導体の前記第1の層と前記バッファ構造との間に配置された窒化物半導体の更なる層を含み、
前記窒化物半導体の更なる層が、前記窒化物半導体の前記第1の層よりも高いドーピング濃度を有する、請求項5に記載の半導体構造。 - 前記窒化物半導体の前記更なる層が窒化ガリウムベース半導体を含む、請求項9に記載の半導体構造。
- 前記窒化物半導体の前記更なる層がGaNを含む、請求項9に記載の半導体構造。
- 前記窒化物半導体の前記第1の層が前記バッファ構造の全幅を覆い、
前記第1の金属層が前記窒化物半導体の前記第1の層の全幅を覆う、請求項5に記載の半導体構造。 - 前記窒化物半導体の前記第1の層が前記バッファ構造の一部分を覆い、
前記第1の金属層が前記窒化物半導体の前記第1の層の全幅を覆う、請求項5に記載の半導体構造。
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| US43083702P | 2002-12-04 | 2002-12-04 | |
| PCT/US2003/038593 WO2004051707A2 (en) | 2002-12-04 | 2003-12-02 | Gallium nitride-based devices and manufacturing process |
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| JPH07231959A (ja) * | 1994-02-23 | 1995-09-05 | Torai Toentei One Kk | スタンド付きゴルフバッグ |
| CN1034730C (zh) * | 1992-09-29 | 1997-04-30 | 南京师范大学 | 盐藻的收集与β-胡萝卜素的提取方法 |
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| US7601441B2 (en) * | 2002-06-24 | 2009-10-13 | Cree, Inc. | One hundred millimeter high purity semi-insulating single crystal silicon carbide wafer |
| US20070063186A1 (en) * | 2003-06-26 | 2007-03-22 | Rj Mears, Llc | Method for making a semiconductor device including a front side strained superlattice layer and a back side stress layer |
| US20070063185A1 (en) * | 2003-06-26 | 2007-03-22 | Rj Mears, Llc | Semiconductor device including a front side strained superlattice layer and a back side stress layer |
| TWI252599B (en) * | 2004-04-27 | 2006-04-01 | Showa Denko Kk | N-type group III nitride semiconductor layered structure |
| US7417266B1 (en) | 2004-06-10 | 2008-08-26 | Qspeed Semiconductor Inc. | MOSFET having a JFET embedded as a body diode |
| KR100670531B1 (ko) * | 2004-08-26 | 2007-01-16 | 엘지이노텍 주식회사 | 질화물 반도체 발광소자 및 그 제조방법 |
| EP1794813B1 (en) | 2004-08-26 | 2015-05-20 | LG Innotek Co., Ltd. | Nitride semiconductor light emitting device and fabrication method thereof |
| FR2875338B1 (fr) * | 2004-09-13 | 2007-01-05 | Picogiga Internat Soc Par Acti | Methode d'elaboration de structures hemt piezoelectriques a desordre d'alliage nul |
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-
2003
- 2003-11-25 US US10/721,488 patent/US7115896B2/en not_active Expired - Lifetime
- 2003-12-02 JP JP2004557590A patent/JP4095066B2/ja not_active Expired - Fee Related
- 2003-12-02 EP EP03796650A patent/EP1568083A4/en not_active Withdrawn
- 2003-12-02 DE DE10392313.6T patent/DE10392313B4/de not_active Expired - Fee Related
- 2003-12-02 AU AU2003298891A patent/AU2003298891A1/en not_active Abandoned
- 2003-12-02 KR KR1020047013012A patent/KR100773997B1/ko not_active Expired - Fee Related
- 2003-12-02 CN CNA2003801004870A patent/CN1692499A/zh active Pending
- 2003-12-02 WO PCT/US2003/038593 patent/WO2004051707A2/en not_active Ceased
- 2003-12-04 TW TW092134195A patent/TWI249246B/zh not_active IP Right Cessation
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2006
- 2006-03-09 US US11/371,738 patent/US20060154455A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034730C (zh) * | 1992-09-29 | 1997-04-30 | 南京师范大学 | 盐藻的收集与β-胡萝卜素的提取方法 |
| JPH07231959A (ja) * | 1994-02-23 | 1995-09-05 | Torai Toentei One Kk | スタンド付きゴルフバッグ |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100773997B1 (ko) | 2007-11-08 |
| TWI249246B (en) | 2006-02-11 |
| CN1692499A (zh) | 2005-11-02 |
| US7115896B2 (en) | 2006-10-03 |
| EP1568083A2 (en) | 2005-08-31 |
| WO2004051707A2 (en) | 2004-06-17 |
| US20060154455A1 (en) | 2006-07-13 |
| KR20050084774A (ko) | 2005-08-29 |
| JP2005527988A (ja) | 2005-09-15 |
| AU2003298891A1 (en) | 2004-06-23 |
| EP1568083A4 (en) | 2010-07-14 |
| DE10392313T5 (de) | 2005-10-06 |
| US20040119063A1 (en) | 2004-06-24 |
| TW200428652A (en) | 2004-12-16 |
| WO2004051707A3 (en) | 2005-02-17 |
| DE10392313B4 (de) | 2014-07-10 |
| AU2003298891A8 (en) | 2004-06-23 |
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