JP2019208022A - Iii−n半導体構造およびiii−n半導体構造の形成方法 - Google Patents
Iii−n半導体構造およびiii−n半導体構造の形成方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims description 25
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 94
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000000758 substrate Substances 0.000 claims abstract description 65
- 239000000872 buffer Substances 0.000 claims abstract description 50
- 239000012212 insulator Substances 0.000 claims abstract description 23
- 229910002704 AlGaN Inorganic materials 0.000 claims abstract description 20
- 230000007704 transition Effects 0.000 claims description 40
- 238000011065 in-situ storage Methods 0.000 claims description 26
- 230000006911 nucleation Effects 0.000 claims description 18
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- 238000010276 construction Methods 0.000 claims 1
- 239000004411 aluminium Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 236
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 37
- 229910002601 GaN Inorganic materials 0.000 description 36
- 235000012431 wafers Nutrition 0.000 description 35
- 229910017083 AlN Inorganic materials 0.000 description 22
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- LALRXNPLTWZJIJ-UHFFFAOYSA-N triethylborane Chemical compound CCB(CC)CC LALRXNPLTWZJIJ-UHFFFAOYSA-N 0.000 description 2
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
セミコンダクタ・オン・インシュレータ基板と、
少なくとも第1の超格子ブロックと、前記第1の超格子ブロック上に形成された第2の超格子ブロックとを含む超格子を備えるバッファ構造と、
前記バッファ構造上に配置されたIII−N半導体チャネル層と、を備え、
前記第1の超格子ブロックは、第1の超格子ユニットの繰り返しシーケンスを含み、各第1の超格子ユニットは、AlGaNの層のスタックを含み、前記スタックの隣接する層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロックは、第2の超格子ユニットの繰り返しシーケンスを含み、各第2の超格子ユニットは、AlGaNの層のスタックを含み、前記スタックの隣接する層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロックの平均アルミニウム含有量は、前記第1の超格子ブロックの平均アルミニウム含有量より大きい
半導体構造。
前記方法は、
セミコンダクタ・オン・インシュレータ基板上にバッファ構造を形成するステップを含み、
前記バッファ構造を形成するステップは、
前記第1の超格子ブロック上に少なくとも第1の超格子ブロックと第2の超格子ブロックとを含む超格子を形成するステップを含み、
前記方法は、
前記バッファ構造上にIII−N半導体チャネル層をエピタキシャル成長させるステップと、を含み、
前記第1の超格子ブロックは、第1の超格子ユニットの繰り返しシーケンスをエピタキシャル成長させることによって形成され、各第1の超格子ユニットは、AlGaN層のスタックを含み、前記スタックの隣接層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロックは、第2の超格子ユニットの繰り返しシーケンスをエピタキシャル成長させることによって形成され、各第2の超格子ユニットは、AlGaN層のスタックを含み、前記スタックの隣接層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロックの平均アルミニウム含有量は、前記第1の超格子ブロックの平均アルミニウム含有量より大きい
方法。
・200nm厚のAlN核形成層210
・50nmのAl0.75GaN下部遷移層220
・超格子230:
・[5nmのAlN/28nmのAl0.15GaN]2層の超格子ユニットの50回の繰り返しによって形成された1.65μm厚の第1の超格子ブロック231(平均アルミニウム含有量AL%=28%に対応)
・[10nmのAlN/28nmのAl0.3GaN]2層の超格子ユニットを40回繰り返すことによって形成された1.5μm厚の第2の超格子ブロック232(平均アルミニウム含有量AL%=48%に対応)
・1μm厚の炭素ドープGaN上部遷移層240
・300nmのGaNチャネル層300
・200nm厚のAlN核形成層210
・50nmのAl0.75GaN下部遷移層220
・超格子230:
・[5nmのAlN/28nmのAl0.15GaN]2層の超格子ユニットの50回の繰り返しによって形成された1.65μm厚の第1の超格子ブロック231(平均アルミニウム含有量AL%=28%に対応)
・[7nmのAlN/28nmのAl0.15GaN]2層の超格子ユニットを15回繰り返して形成された0.5μm厚の第2の超格子ブロック232(平均アルミニウム含有量AL%=32%に対応)
・[4nmのAlN/30nmのAl0.1GaN]2層の超格子ユニットの50回の繰り返しによって形成された1.65μm厚の第3の超格子ブロック233(平均アルミニウム含有量AL%=20.6%に対応)
・[5nmのAlN/30nmのAl0.1GaN]2層の超格子ユニットの15回の繰り返しによって形成された0.5μm厚の第4の超格子ブロック234(平均アルミニウム含有量AL%=22.9%に対応)
・1μm厚の炭素ドープGaN上部遷移層240
・400nmのGaNチャネル層300
Claims (15)
- III−N半導体構造であって、
セミコンダクタ・オン・インシュレータ基板(100)と、
少なくとも第1の超格子ブロック(231)と、前記第1の超格子ブロック(231)上に形成された第2の超格子ブロック(232)とを含む超格子(230)を備えるバッファ構造(200)と、
前記バッファ構造(200)上に配置されたIII−N半導体チャネル層(300)と、を備え、
前記第1の超格子ブロック(231)は、第1の超格子ユニット(231−1,231−2)の繰り返しシーケンスを含み、各第1の超格子ユニット(231−1,231−2)は、AlGaNの層のスタックを含み、前記スタックの隣接する層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロック(232)は、第2の超格子ユニット(232−1,232−2)の繰り返しシーケンスを含み、各第2の超格子ユニット(232−1,232−2)は、AlGaNの層のスタックを含み、前記スタックの隣接する層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロック(232)の平均アルミニウム含有量は、前記第1の超格子ブロック(231)の平均アルミニウム含有量より大きい
半導体構造。 - 前記バッファ構造(200)の前記超格子(230)は、複数の超格子ブロック(230L,231,232,230U)を含み、前記第1および第2の超格子ブロック(231,232)は、前記超格子(230)の超格子ブロックの隣接対を形成する請求項1に記載の半導体構造。
- 前記超格子(230)は、前記第2の超格子ブロック(232)の上に形成され、前記第2の超格子ブロック(232)の平均アルミニウム含有量よりも少ない平均アルミニウム含有量を有する上部超格子ブロック(230U)を含む請求項1または2に記載の半導体構造。
- 前記超格子(230)は、前記第1の超格子ブロック(231)の下に形成され、前記第1の超格子ブロック(231)の平均アルミニウム含有量よりも大きい平均アルミニウム含有量を有する下部超格子ブロック(230L)を含む請求項1ないし3のうちいずれか1項に記載の半導体構造。
- 前記超格子(230)は、前記第2の超格子ブロック(232)上に形成された第3の超格子ブロック(233)と、前記第3の超格子ブロック(233)上に形成された第4の超格子(234)ブロックとを含み、
前記第4の超格子ブロック(234)の平均アルミニウム含有量は、前記第3の超格子ブロック(233)の平均アルミニウム含有量よりも大きく、かつ、前記第3の超格子ブロック(233)の平均アルミニウム含有量は、前記第2の超格子ブロック(232)の平均アルミニウム含有量よりも小さい請求項1ないし4のうちいずれか1項に記載の半導体構造。 - 前記セミコンダクタ・オン・インシュレータ基板(100)は、下部ウエハ(110)、上部半導体層(130)、および前記下部ウエハと前記上部半導体層との間の絶縁体層(120)を含み、前記バッファ構造(200)とIII−N半導体チャネル層(300)とを合わせた厚さは、上部半導体層(130)の厚さより大きい請求項1ないし5のうちいずれか1項記載の半導体構造。
- 前記バッファ構造(200)は、前記セミコンダクタ・オン・インシュレータ基板(100)上に形成されたAlN核形成層(210)を含む請求項1ないし6のうちいずれか1項に記載の半導体構造。
- 前記バッファ構造(200)は、(Al)GaNの下部遷移層(220)をさらに備え、前記超格子(230)は、前記下部遷移層(220)上に形成される請求項7に記載の半導体構造。
- 前記バッファ構造(200)は、前記超格子(230)上に形成された(Al)GaNの上部遷移層(240)をさらに備える請求項1ないし8のうちいずれか1項に記載の半導体構造。
- III−N半導体構造を形成するための方法であって、
前記方法は、
セミコンダクタ・オン・インシュレータ基板(100)上にバッファ構造(200)を形成するステップを含み、
前記バッファ構造(200)を形成するステップは、
前記第1の超格子ブロック(231)上に少なくとも第1の超格子ブロック(231)と第2の超格子ブロック(232)とを含む超格子(230)を形成するステップを含み、
前記方法は、
前記バッファ構造(200)上にIII−N半導体チャネル層(300)をエピタキシャル成長させるステップと、を含み、
前記第1の超格子ブロック(231)は、第1の超格子ユニット(231−1,231−2)の繰り返しシーケンスをエピタキシャル成長させることによって形成され、各第1の超格子ユニット(231−1,231−2)は、AlGaN層のスタックを含み、前記スタックの隣接層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロック(232)は、第2の超格子ユニット(232−1,232−2)の繰り返しシーケンスをエピタキシャル成長させることによって形成され、各第2の超格子ユニット(232−1,232−2)は、AlGaN層のスタックを含み、前記スタックの隣接層は、異なるアルミニウム含有量を有し、
前記第2の超格子ブロック(232)の平均アルミニウム含有量は、前記第1の超格子ブロック(231)の平均アルミニウム含有量より大きい
方法。 - 前記超格子(230)を形成するステップは、複数の超格子ブロック(230L,231,232,230U)を形成するステップを含み、前記第1および第2の超格子ブロック(231,232)は、前記超格子(230)の隣接する対を形成するステップを含む請求項10に記載の方法。
- 前記超格子(230)を形成するステップは、前記第2の超格子ブロック(232)上に前記第2の超格子ブロック(232)の平均アルミニウム含有量よりも少ない平均アルミニウム含有量を有する上部超格子ブロック(230U)を形成するステップを含む請求項10または11に記載の方法。
- 前記セミコンダクタ・オン・インシュレータ基板(100)は、下部ウエハ(110)と、上部半導体層(130)と、前記下部ウエハと前記上部半導体層との中間にある絶縁体層(120)とを含み、前記バッファ構造(200)および前記III−N半導体チャネル層(300)は、上部半導体層(130)の厚さよりも大きい合計厚さで形成される請求項10ないし12のうちいずれか1項に記載の方法。
- 前記第2の超格子ブロック(232)のインサイチュ曲率の時間変化率が0以下になるように、前記第2の超格子ブロック(232)を成長させる請求項10ないし13のうちいずれか1項に記載の方法。
- 前記超格子(230)の少なくとも1つの隣接する対の層の間に少なくとも部分的な歪み緩和が生じるように、前記超格子(230)を成長させる請求項10ないし14のうちいずれか1項に記載の方法。
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