JP5771678B2 - 高電力絶縁ゲート・バイポーラ・トランジスタ - Google Patents
高電力絶縁ゲート・バイポーラ・トランジスタ Download PDFInfo
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Description
本発明は、ONR/DARPAによって与えられた契約番号第N00014−05−C−0202号の下、米国政府の支援によってなされたものである。米国政府は本発明に関して一定の権利を有する。
本出願は、2006年8月17日に出願された「High Power Insulated Gate Bipolar Transistors」という名称の米国仮特許出願第60/838,249号に基づく利益および優先権を主張するものである。この仮出願の開示は、その全体が本明細書に記載されているかのように、参照によって本明細書に組み込まれる。
[態様1]
第1の導電型を有する基板と、
前記第1の導電型とは反対の第2の導電型を有するドリフト層と、
前記ドリフト層内にあって前記第1の導電型を有するウェル領域と、
前記ドリフト層上にあって前記第2の導電型を有するエピタキシャル・チャネル調整層と、
前記エピタキシャル・チャネル調整層の表面から前記エピタキシャル・チャネル調整層を貫通して前記ウェル領域内へ延びるエミッタ領域であって、前記第2の導電型を有し、該エミッタ領域に隣接した前記ウェル領域内にチャネル領域を少なくとも部分的に画定するエミッタ領域と、
前記チャネル領域上のゲート酸化物層と、
前記ゲート酸化物層上のゲートと
を含む絶縁ゲート・バイポーラ・トランジスタ。
[態様2]
前記ドリフト層は前記ウェル領域に隣接したJFET領域を含み、前記エミッタ領域は、前記JFET領域から間隔を置いて配置され、該エミッタ領域と前記JFET領域の間に前記チャネル領域を画定する、態様1に記載のトランジスタ。
[態様3]
前記第1の導電型はn型であり、前記第2の導電型はp型である、態様1に記載のトランジスタ。
[態様4]
前記チャネル調整層の表面から前記ウェル領域内へ延びる前記第1の導電型のコネクタ領域と、
前記コネクタ領域上の第1のオーミック・コンタクトと、
前記エミッタ領域上にあって、前記第1のオーミック・コンタクトとは異なる材料を含む第2のオーミック・コンタクトと、
前記第1のオーミック・コンタクトと前記第2のオーミック・コンタクトとを電気的に接続した金属オーバレイヤと
をさらに含む、態様1に記載のトランジスタ。
[態様5]
前記第1のオーミック・コンタクトはニッケル・ベースの導電材料を含み、前記第2のオーミック・コンタクトはアルミニウム・ベースの導電材料を含む、態様4に記載のトランジスタ。
[態様6]
前記チャネル調整層は約0.25μm以上の厚さを有する、態様1に記載のトランジスタ。
[態様7]
前記エミッタ領域の底面から前記ウェル領域の底面までの距離は約0.45μm以上である、態様1に記載のトランジスタ。
[態様8]
前記チャネル調整層は、約0.1μmから約0.5μmの厚さ、および約1×1016cm−3から約5×1018cm−3の正味ドーピング濃度を有する、態様1に記載のトランジスタ。
[態様9]
前記基板は炭化シリコン基板を含み、前記ドリフト層は、前記基板上の炭化シリコン・エピタキシャル層を含む、態様1に記載のトランジスタ。
[態様10]
n型基板と、
p型ドリフト層と、
前記ドリフト層内のn型ウェルと、
前記ドリフト層上のp型チャネル調整層と、
前記チャネル調整層を貫通して前記n型ウェル内へ延びるp型エミッタ領域であって、該p型エミッタ領域に隣接した前記n型ウェル内にチャネル領域を少なくとも部分的に画定するp型エミッタ領域と、
前記チャネル調整層を貫通して前記n型ウェル内へ延びるn型コネクタ領域と、
前記p型エミッタ領域上にあってアルミニウムを含む第1のオーミック・コンタクトと、
前記n型コネクタ領域上にあってニッケルを含む第2のオーミック・コンタクトと、
前記チャネル領域上のゲート酸化物層と、
前記ゲート酸化物層上のゲートと、
前記ゲート上にあって、前記第1のオーミック・コンタクトを露出させる第1の開口と、前記第2のオーミック・コンタクトを露出させる第2の開口とを含む層間誘電体層と、
前記層間誘電体層上にあって、前記第1のオーミック・コンタクトと前記第2のオーミック・コンタクトとを電気的に接続する金属オーバレイヤと
を含むトランジスタ。
[態様11]
絶縁ゲート・バイポーラ・トランジスタ(IGBT)デバイスを形成する方法であって、
n型基板上にp型ドリフト層を形成する工程と、
前記p型ドリフト層内にn型ウェルを形成する工程と、
前記p型ドリフト層上および前記n型ウェル上にp型チャネル調整層をエピタキシャル成長させる工程と、
前記チャネル調整層を貫通して、前記ドリフト層の表面の前記n型ウェル内へ延びるp型エミッタ領域であって、該p型エミッタ領域に隣接した前記n型ウェル内にチャネル領域を少なくとも部分的に画定するp型エミッタ領域を形成するために、p型ドーパント・イオンを注入する工程と
前記チャネル層を貫通して、前記ドリフト層の表面の前記n型ウェル内へ延びるn型コネクタ領域を形成するために、n型ドーパント・イオンを注入すること、
前記注入されたイオンをアニールする工程と、
前記チャネル領域上にゲート酸化物層を形成する工程と、
前記ゲート酸化物層上にゲートを形成する工程と
を含む方法。
[態様12]
前記チャネル調整層上に黒鉛コーティングを形成する工程をさらに含み、前記注入されたイオンをアニールする工程は、前記チャネル調整層および前記黒鉛コーティングをアニールする工程を含み、
前記注入されたイオンをアニールする工程の後に前記黒鉛コーティングを除去する工程をさらに含む、態様11に記載の方法。
[態様13]
前記注入されたイオンをアニールする工程の前に前記黒鉛コーティングを結晶化させる工程をさらに含む、態様12に記載の方法。
[態様14]
前記注入されたイオンをアニールする工程は、前記注入されたイオンを1700℃よりも高い温度でアニールする工程を含む、態様12に記載の方法。
[態様15]
前記注入されたイオンをアニールする工程は、前記注入されたイオンを1800℃よりも高い温度でアニールする工程を含む、態様12に記載の方法。
[態様16]
前記ゲート酸化物層を形成する工程は、前記ゲート酸化物層を乾燥O2中で形成する工程を含み、前記方法はさらに、前記ゲート酸化物層を湿潤O2中でアニールする工程を含む、態様11に記載の方法。
[態様17]
前記ゲート酸化物層を形成する工程は、前記ゲート酸化物層を乾燥O2中で約1200℃以下の温度で形成する工程を含む、態様16に記載の方法。
[態様18]
前記ゲート酸化物層を形成する工程の後、前記ゲート酸化物層を湿潤O2中でアニールする工程の前に、前記ゲート酸化物層を不活性雰囲気で約1200℃以下の温度でアニールする工程をさらに含む、態様16に記載の方法。
[態様19]
前記ゲート酸化物層を湿潤O2中でアニールする工程は、前記ゲート酸化物層を湿潤O2中で約950℃以下の温度でアニールすることを含む、態様16に記載の方法。
[態様20]
前記ゲート酸化物層を湿潤O2中でアニールする工程は、前記ゲート酸化物層を湿潤O2中で少なくとも1時間アニールする工程を含む。態様19に記載の方法。
[態様21]
前記酸化物層を湿潤O2中でアニールする工程は、発熱室内において発熱性水蒸気を発生させる工程と、前記発熱性水蒸気をアニール室に供給する工程と、前記アニール室内で前記酸化物層をアニールする工程とを含む、態様16に記載の方法。
[態様22]
発熱性水蒸気を発生させる工程は、前記発熱室を加熱する工程と、前記発熱室に水素および酸素ガスを供給する工程と、前記発熱性水蒸気を形成するために、前記水素ガスおよび前記酸素ガスを燃焼させる工程とを含み、前記水素ガスおよび前記酸素ガスは、酸素に対する水素の分子比を約1.8以上として前記発熱室に供給される、態様21に記載の方法。
[態様23]
前記n型ウェルに隣接したJFET領域を形成するために、前記ドリフト層内へp型ドーパント・イオンを注入することをさらに含み、前記p型エミッタ領域は、前記JFET領域から間隔を置いて配置され、該p型エミッタ領域と前記JFET領域の間にチャネル領域を画定する、態様11に記載の方法。
[態様24]
前記チャネル調整層は、約0.1μmから約0.5μmの厚さを有するように形成され、前記チャネル調整層は、約1×1016cm−3から約5×1018cm−3の正味アクセプタ濃度を有する、態様11に記載の方法。
[態様25]
前記基板は炭化シリコンを含み、前記ドリフト層はエピタキシャル炭化シリコン層を含む、態様11に記載の方法。
Claims (9)
- 絶縁ゲート・バイポーラ・トランジスタ(IGBT)デバイスを形成する方法であって、
n型基板上にp型ドリフト層を形成する工程と、
前記p型ドリフト層内にn型ウェルを形成する工程と、
前記p型ドリフト層上および前記n型ウェル上にp型チャネル調整層をエピタキシャル成長させる工程と、
前記チャネル調整層を貫通して、前記ドリフト層の表面の前記n型ウェル内へ延びるp型エミッタ領域であって、該p型エミッタ領域に隣接した前記n型ウェル内にチャネル領域を少なくとも部分的に画定するp型エミッタ領域を形成するために、p型ドーパント・イオンを注入する工程と、
前記チャネル調整層を貫通して、前記ドリフト層の表面の前記n型ウェル内へ延びるn型コネクタ領域を形成するために、n型ドーパント・イオンを注入する工程と、
前記チャネル領域上にゲート酸化物層を形成する工程と、
前記ゲート酸化物層上にゲートを形成する工程と、
前記チャネル調整層の表面上に黒鉛コーティングをレジスト・コーティング法により形成する工程と、
前記黒鉛コーティングを結晶化させる工程と、
前記注入されたイオンおよび前記黒鉛コーティングをアニールする工程と、
前記注入されたイオンのアニーリング後に前記黒鉛コーティングを除去する工程
を含み、
前記黒鉛コーティングは、前記注入されたイオンおよび前記黒鉛コーティングのアニールの間、前記チャネル調整層の表面を保護する、方法。 - 請求項1に記載の方法であって、
前記注入されたイオンをアニールする工程は、前記注入されたイオンを1800℃よりも高い温度でアニールする工程
を含む、方法。 - 請求項1に記載の方法であって、
前記ゲート酸化物層を形成する工程は、前記ゲート酸化物層を乾燥O2中で形成する工程を含み、前記方法はさらに、前記ゲート酸化物層を湿潤O2中でアニールする工程
を含む、方法。 - 請求項3に記載の方法であって、
前記ゲート酸化物層を形成する工程の後、前記ゲート酸化物層を湿潤O2中でアニールする工程の前に、前記ゲート酸化物層を不活性雰囲気で約1200℃以下の温度でアニールする工程
をさらに含む、方法。 - 請求項3に記載の方法であって、
前記ゲート酸化物層を湿潤O2中でアニールする工程は、前記ゲート酸化物層を湿潤O2中で約950℃以下の温度でアニールすること
を含む、方法。 - 請求項3に記載の方法であって、
前記ゲート酸化物層を湿潤O2中でアニールする工程は、発熱室内において発熱性水蒸気を発生させる工程と、前記発熱性水蒸気をアニール室に供給する工程と、前記アニール室内で前記ゲート酸化物層をアニールする工程
を含む、方法。 - 請求項6に記載の方法であって、
前記発熱性水蒸気を発生させる工程は、前記発熱室を加熱する工程と、前記発熱室に水素および酸素ガスを供給する工程と、前記発熱性水蒸気を形成するために、前記水素ガスおよび前記酸素ガスを燃焼させる工程とを含み、前記水素ガスおよび前記酸素ガスは、酸素に対する水素の分子比を約1.8以上として前記発熱室に供給される、
方法。 - 請求項1に記載の方法であって、
前記チャネル調整層は、約0.1μmから約0.5μmの厚さを有するように形成され、
前記チャネル調整層は、約1×1016cm−3から約5×1018cm−3の正味アクセプタ濃度を有する、方法。 - 請求項1に記載の方法であって、
前記基板は炭化シリコンを含み、前記ドリフト層はエピタキシャル炭化シリコン層を含む、方法。
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| Publication number | Publication date |
|---|---|
| JP2014078747A (ja) | 2014-05-01 |
| EP2631951A2 (en) | 2013-08-28 |
| KR101529331B1 (ko) | 2015-06-16 |
| WO2008020911A2 (en) | 2008-02-21 |
| US8710510B2 (en) | 2014-04-29 |
| WO2008020911A3 (en) | 2008-04-10 |
| KR20090052878A (ko) | 2009-05-26 |
| US9548374B2 (en) | 2017-01-17 |
| EP2052414A2 (en) | 2009-04-29 |
| EP2631951B1 (en) | 2017-10-11 |
| CN101501859B (zh) | 2011-05-25 |
| EP2631951A3 (en) | 2013-09-04 |
| EP2052414B1 (en) | 2016-03-30 |
| JP2010521799A (ja) | 2010-06-24 |
| JP5645404B2 (ja) | 2014-12-24 |
| US20150287805A1 (en) | 2015-10-08 |
| US20080105949A1 (en) | 2008-05-08 |
| CN101501859A (zh) | 2009-08-05 |
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