JP2009503815A - 窒化物ベースのトランジスタおよびエッチストップ層を用いた製造方法 - Google Patents
窒化物ベースのトランジスタおよびエッチストップ層を用いた製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 27
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- 229910002601 GaN Inorganic materials 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 37
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- 239000000758 substrate Substances 0.000 claims description 23
- 238000005530 etching Methods 0.000 claims description 21
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 14
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
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- 230000007704 transition Effects 0.000 description 6
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 5
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
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- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
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Abstract
Description
Claims (33)
- III窒化物ベースのトランジスタであって、
基板と、
前記基板上にある第1の窒化物ベース層と、
前記第1の窒化物ベース層上にあるエッチストップ層と、
前記エッチストップ層上にある誘電体層と、
前記誘電体層を貫通して広がるゲートリセスと、
前記ゲートリセス内のゲート接点と
を備えることを特徴とするIII窒化物ベースのトランジスタ。 - 前記ゲートリセスは、前記エッチストップ層を貫通して前記第1の窒化物ベース層まで広がり、前記ゲートリセス内の前記ゲート接点は、前記エッチストップ層を貫通して前記第1の窒化物ベース層に電気的に接触することを特徴とする請求項1に記載のデバイス。
- 前記エッチストップ層は、AlN、GaN、AlGaNおよび/またはSiO2を含むことを特徴とする請求項1に記載のデバイス。
- 前記エッチストップ層は、スパッタAlNを含むことを特徴とする請求項1に記載のデバイス。
- 前記基板は、炭化ケイ素またはサファイアを含むことを特徴とする請求項1に記載のデバイス。
- 前記トランジスタは、MESFET、JFET、MOSFET、MISHFET、またはIGBTを備えることを特徴とする請求項1に記載のデバイス。
- 前記誘電体層は、SiN、SiO2および/またはSiONを含むことを特徴とする請求項1に記載のデバイス。
- 前記ゲート接点は、Tゲート構造を備えることを特徴とする請求項1に記載のデバイス。
- ソース/ドレイン接点
をさらに備え、前記ゲート接点は、前記ゲート接点と前記ソース/ドレイン接点との間で前記誘電体層の少なくとも一部分を覆って広がる、フィールドプレート延長部をさらに備えることを特徴とする請求項1に記載のデバイス。 - 前記第1の窒化物ベース層と前記ゲート接点との間に、絶縁層をさらに備えることを特徴とする請求項1に記載のデバイス。
- 前記絶縁層は、SiN、AlN、SiO2および/またはONO構造を含むことを特徴とする請求項10に記載のデバイス。
- 高温逆バイアスストレス試験中に、破局的に故障しないように構成されることを特徴とする請求項1に記載のデバイス。
- 高温逆バイアスストレス試験後に、電力出力が約1dB未満変化するように構成されることを特徴とする請求項1に記載のデバイス。
- 高温逆バイアスストレス試験後に、電力出力が約0.3dB未満変化するように構成されることを特徴とする請求項1に記載のデバイス。
- 前記ゲートリセスは、前記エッチストップ層中に部分的にだけ広がり、前記エッチストップ層は、キャップ層を備えることを特徴とする請求項1に記載のデバイス。
- 前記エッチストップ層と前記第1の窒化物ベース層との間に、キャップ層をさらに備えることを特徴とする請求項1に記載のデバイス。
- 前記ゲートリセスは、前記誘電体層および前記エッチストップ層を貫通して、前記キャップ層まで広がることを特徴とする請求項16に記載のデバイス。
- 前記キャップ層は、in−situ成長させたSiNを含むことを特徴とする請求項16に記載のデバイス。
- III窒化物ベースの高電子移動度トランジスタ(HEMT)であって、
基板と、
前記基板上にある窒化物ベースの第1の層であって、GaN、AlGaN、InGaNおよび/またはAlInGaNを含む第1の層と、
前記第1の層上にある窒化物ベースの第2の層であって、GaN、AlN、AlGaN、AlInNおよび/またはAlInGaNを含み、前記第1の層とは異なる第2の層と、
前記第2の層上にある第3の層であって、SiO2、GaN、AlGaNおよび/またはスパッタAlNを含み、前記第2の層とは異なる第3の層と、
前記第3の層上にある第4の層であって、SiN、SiO2および/またはSiONを含み、前記第3の層とは異なる第4の層と、
前記第4の層を貫通して広がるゲートリセスと、
前記ゲートリセス内のゲート接点と
を備えることを特徴とするIII窒化物ベースの高電子移動度トランジスタ(HEMT)。 - 前記ゲートリセスは、前記第3の層を貫通して前記第2の層まで広がり、前記ゲートリセス内の前記ゲート接点は、前記第3の層を貫通して前記第2の層に電気的に接触することを特徴とする請求項19に記載のデバイス。
- 前記ゲートリセスは、前記第3の層中に部分的に広がり、前記ゲートリセス内の前記ゲート接点は、前記第2の層に電気的に接触しないことを特徴とする請求項19に記載のデバイス。
- 前記窒化物ベースの第2の層と前記第3の層との間に、第5の層をさらに備え、前記第3の層は、GaN、AlGaN、InGaNおよび/またはSiNを含み、前記第2および第3の層とは異なることを特徴とする請求項19に記載のデバイス。
- 前記ゲートリセスは、前記第3および第4の層を貫通して前記第5の層まで広がることを特徴とする請求項22に記載のデバイス。
- 前記SiNは、in−situ成長させたSiNを含むことを特徴とする請求項23に記載のデバイス。
- III窒化物ベースのトランジスタを製造する方法であって、
基板上に第1の窒化物ベース層を形成すること、
前記第1の窒化物ベース層上にエッチストップ層を形成すること、
前記エッチストップ層上に、前記エッチストップ層とは異なる誘電体層を形成すること、
前記誘電体層を前記エッチストップ層まで選択的にエッチングして、前記誘電体層を貫通して前記エッチストップ層まで広がるゲートリセスを形成すること、および
前記ゲートリセス内にゲート接点を形成すること
を含むことを特徴とする方法。 - 前記誘電体層を前記エッチストップ層まで選択的にエッチングした後、前記ゲートリセス内の前記エッチストップ層を、前記第1の窒化物ベース層まで選択的にエッチングすることをさらに含むことを特徴とする請求項25に記載の方法。
- 前記誘電体層を選択的にエッチングすることは、前記エッチストップ層がそれに対して耐性のあるエッチング液で、前記誘電体層を乾式エッチングすることを含むことを特徴とする請求項25に記載の方法。
- 前記誘電体層を乾式エッチングすることは、SF6、SF6/O2、CF4またはCF4/O2を含むエッチング種でエッチングすることを含むことを特徴とする請求項27に記載の方法。
- 前記誘電体層の乾式エッチング後、前記エッチストップ層を選択的にエッチングすることは、前記エッチストップ層の湿式エッチングを含むことを特徴とする請求項27に記載の方法。
- 前記エッチストップ層を湿式エッチングすることは、水酸化物ベース現像液、加熱した水酸化物ベース溶液、BOE、またはBHFでエッチングすることを含むことを特徴とする請求項29に記載の方法。
- 前記エッチストップ層を湿式エッチングすることは、フォトエンハンスド電気化学湿式エッチングすることを含むことを特徴とする請求項29に記載の方法。
- 前記第1の窒化物ベース層を形成することと前記エッチストップ層を形成することの間に、以下の、
前記第1の窒化物ベース層上に、前記エッチストップ層とは異なるキャップ層を形成すること
が実施され、
エッチストップ層を形成することは、前記キャップ層上に、前記キャップ層とは異なるエッチストップ層を形成することを含む
ことを特徴とする請求項25に記載の方法。 - 前記キャップ層を形成することは、SiNのin−situ成長によって実施されることを特徴とする請求項32に記載の方法。
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US11121216B2 (en) | 2016-05-31 | 2021-09-14 | Transphorm Technology, Inc. | III-nitride devices including a graded depleting layer |
JP2017195400A (ja) * | 2017-06-20 | 2017-10-26 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
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EP1905097A2 (en) | 2008-04-02 |
WO2007018918A2 (en) | 2007-02-15 |
US20130252386A1 (en) | 2013-09-26 |
US9142636B2 (en) | 2015-09-22 |
WO2007018918A3 (en) | 2007-06-07 |
EP2479790B1 (en) | 2015-03-25 |
US20070018199A1 (en) | 2007-01-25 |
EP2479790A2 (en) | 2012-07-25 |
EP1905097B1 (en) | 2013-09-18 |
EP2479790A3 (en) | 2012-10-10 |
JP2014003301A (ja) | 2014-01-09 |
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