JP5848334B2 - 半導体デバイスを成長させるための複合成長用基板 - Google Patents
半導体デバイスを成長させるための複合成長用基板 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 92
- 239000004065 semiconductor Substances 0.000 title claims description 20
- 239000002131 composite material Substances 0.000 title description 17
- 239000000463 material Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 25
- 150000004767 nitrides Chemical class 0.000 claims description 18
- 229910002704 AlGaN Inorganic materials 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 229910052738 indium Inorganic materials 0.000 claims description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 4
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- 229910052733 gallium Inorganic materials 0.000 description 10
- 238000005530 etching Methods 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
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- 241000894007 species Species 0.000 description 3
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- JRVCPDVOFCWKAG-UHFFFAOYSA-N Amosulalol hydrochloride Chemical compound Cl.COC1=CC=CC=C1OCCNCC(O)C1=CC=C(C)C(S(N)(=O)=O)=C1 JRVCPDVOFCWKAG-UHFFFAOYSA-N 0.000 description 1
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- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
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- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- 238000005498 polishing Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229910002059 quaternary alloy Inorganic materials 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical class F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- -1 thickness Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- 229910052726 zirconium Inorganic materials 0.000 description 1
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- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
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Description
として定義される。三元または四元のIII族窒化物組成AxByCzNのバルク格子定数は、ヴェガード則
に従って推定されてもよい。ここで、aは二元化合物のバルク格子定数である。AlNは3.111Åのバルク格子定数を持ち、InNは3.544Åのバルク格子定数を持ち、GaNは3.1885Åのバルク格子定数を持つ。
ain-plane
が
abulk
と等しくないことを意味している。シード層16がホスト基板12に接続され、成長用基板から解放された場合、例えばボンディング層14を通じて、シード層16とホスト基板12との間の接続が適合していれば、シード層16は、少なくとも部分的に緩和し得る。例えば、III族窒化物デバイスが従来どおりAl2O3上に成長される場合、基板上に成長される第1の層は、一般的には、約3.19の格子定数を有するGaNバッファ層である。GaNバッファ層は、InGaNであることが多い発光層を含め、バッファ層の上に成長したデバイス層の全てに対して面内格子定数を設定する。InGaNは、GaNよりも大きいバルク格子定数を持つため、発光層は、GaNバッファ層の上に成長した場合、歪みを受ける。InGaNシード層を有する複合基板では、緩和後、InGaNシード層は、GaNよりも大きい面内格子定数を持ち得る。このように、InGaNシード層の面内格子定数は、GaNよりも、InGaN発光層のバルク格子定数により近づく。InGaN発光層を含む、InGaNシード層の上に成長したデバイス層は、InGaNシード層の面内格子定数を再現するであろう。従って、緩和されたInGaNシード層上に成長したInGaN発光層は、GaNバッファ層上に成長したInGaN発光層よりも、小さい歪みを受け得る。
として表現され得る。ここで、Yはドナー層の係数であり、dはドナー層の厚みであり、eはドナー層内の歪みである。ドナー層が、ボンディング層を通じて基板に取り付けられ、成長用基板から解放され、その後、ボンディング層のリフローを介して緩和された場合、歪みエネルギーは、ドナー層の緩和を促進する。上記のように、歪みエネルギーは、ドナー層の厚み及びドナー層内の歪みの二乗に比例する。ドナー層の組成は、面内格子定数を決定し、従って、シード層内の歪みを決定する。厚みを増やすことは、歪みエネルギーを大きくし、且つ、緩和中のバックリングに対するドナー層の剛性を大きくするため、ドナー層は、できるだけ厚い方が好ましい。InGaNドナー層の場合、所望の組成のシード層が、厚みの増加につれて、不要な欠陥及び粗い表面形態を作る傾向にある。例えば、10%よりも大きいInN組成、且つ、数百ナノメートルよりも大きい厚みで、十分高品質のInGaNドナー層を成長させることは困難であろう。
Claims (18)
- 半導体構造が成長し得るIII族窒化物材料であるドナー層と、III族窒化物材料である歪み層とを有する、エピタキシャル構造を提供するステップであり、前記ドナー層及び前記歪み層が第1の基板上に成長される、ステップと、
前記エピタキシャル構造を第2の基板に接続するステップと、
前記第1の基板を除去するステップと、
前記第1の基板を除去した後に、前記歪み層を緩和させるように前記エピタキシャル構造を処理するステップであり、前記歪み層の緩和は、前記ドナー層の面内格子定数を変化させる、ステップと、
前記ドナー層を第3の基板に接続するステップと、
前記歪み層を除去するステップと、
を有する方法。 - 前記エピタキシャル構造は、前記ドナー層と前記歪み層との間に配置された緩和層をさらに有する、請求項1記載の方法。
- 前記エピタキシャル構造は、前記ドナー層と前記歪み層との間に配置された第2の緩和層をさらに有する、請求項2記載の方法。
- 前記エピタキシャル構造は、前記ドナー層と前記歪み層との間に配置されたキャップ層をさらに有し、前記キャップ層は、前記ドナー層からのインジウムの脱離を低減または防止する、請求項2記載の方法。
- 前記緩和層は、アルミニウムを有する、請求項2記載の方法。
- 前記エピタキシャル構造は、ボンディング層を通じて前記第2の基板に接続され、
前記処理するステップは、前記ボンディング層を加熱するステップを含む、請求項1記載の方法。 - 前記エピタキシャル構造は、前記ドナー層と前記歪み層との間に配置された低バンドギャップ層をさらに有し、前記低バンドギャップ層は、前記ドナー層及び前記歪み層のバンドギャップよりも低いバンドギャップを持ち、
前記歪み層を除去するステップは、レーザで前記低バンドギャップ層を溶融させるステップを含む、請求項1記載の方法。 - 前記歪み層の歪みは、前記ドナー層内の歪みと少なくとも同程度である、請求項1記載の方法。
- 前記ドナー層は、InGaNまたはGaNであり、
前記歪み層は、AlGaNまたはGaNであり、
前記エピタキシャル構造は、前記ドナー層と前記歪み層との間に配置された緩和層をさらに有し、前記緩和層は、アルミニウムを有する、請求項1記載の方法。 - 前記処理するステップの後に、前記ドナー層は、少なくとも3.2Åの面内格子定数を持つ、請求項1記載の方法。
- 前記処理するステップの後に、n型領域とp型領域との間に配置された発光層を有する構造を前記ドナー層上に成長させるステップをさらに有する、請求項1記載の方法。
- 前記処理するステップの前に、前記ドナー層は圧縮状態にあり、
前記処理するステップは、前記処理するステップの後に前記ドナー層が少なくとも部分的に緩和されるように、前記ドナー層の前記面内格子定数を増加させるステップを有する、請求項1記載の方法。 - 前記処理するステップの前に、前記ドナー層は緩和されており、
前記処理するステップは、前記処理するステップの後に前記ドナー層が引っ張られた状態となるように、前記ドナー層の前記面内格子定数を増加させるステップを有する、請求項1記載の方法。 - 前記処理するステップの前に、前記歪み層は圧縮状態にある、請求項1記載の方法。
- 前記処理するステップの前に、前記歪み層の歪みは、少なくとも0.1%である、請求項1記載の方法。
- 基板と、
ボンディング層によって前記基板に取り付けられたエピタキシャル構造と、を有し、
前記エピタキシャル構造は、
半導体構造が成長し得るIII族窒化物材料であるドナー層と、
III族窒化物材料である歪み層と、
前記ドナー層と前記歪み層との間に配置された緩和層と、
を有する、構造体。 - 前記ボンディング層は、ほうりんけい酸ガラスである、請求項16記載の構造体。
- 前記ドナー層は、InGaNまたはGaNであり、
前記歪み層は、AlGaNまたはGaNであり、
前記緩和層は、アルミニウムを有する、請求項16記載の構造体。
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US12/783,354 US8536022B2 (en) | 2010-05-19 | 2010-05-19 | Method of growing composite substrate using a relaxed strained layer |
PCT/IB2011/051844 WO2011145012A1 (en) | 2010-05-19 | 2011-04-27 | Composite growth substrate for growing a semiconductor device |
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US8536022B2 (en) | 2013-09-17 |
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