JP6508372B2 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- JP6508372B2 JP6508372B2 JP2018026650A JP2018026650A JP6508372B2 JP 6508372 B2 JP6508372 B2 JP 6508372B2 JP 2018026650 A JP2018026650 A JP 2018026650A JP 2018026650 A JP2018026650 A JP 2018026650A JP 6508372 B2 JP6508372 B2 JP 6508372B2
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- 238000004519 manufacturing process Methods 0.000 title description 10
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- 239000001307 helium Substances 0.000 claims description 22
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- 229910052698 phosphorus Inorganic materials 0.000 description 2
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Description
特許文献1 特開2012−199577号公報
特許文献2 国際公開第2013/100155号パンフレット
特許文献3 米国特許第6482681号明細書
特許文献4 米国特許第6707111号明細書
特許文献5 特開2001−160559号公報
特許文献6 特開2001−156299号公報
特許文献7 特開平7−193218号公報
特許文献8 米国特許出願公開第2008−1257号明細書
特許文献9 米国特許出願公開第2008−54369号明細書
半導体装置は、n型の半導体基板を備えてよい。半導体装置は、p型のアノード領域を備えてよい。アノード領域は、半導体基板の表面側に形成されてよい。半導体装置は、n型のフィールドストップ領域を備えてよい。フィールドストップ領域は、半導体基板の裏面側においてプロトンをドナーとして形成されてよい。半導体装置は、n型のカソード領域を備えてよい。カソード領域は、フィールドストップ領域よりも半導体基板の裏面側に形成されてよい。フィールドストップ領域における深さ方向のドナーの濃度分布は、第1のピークと、第1のピークよりも半導体基板の裏面側において第1のピークよりも濃度の低い第2のピークとを有してよい。アノード領域およびカソード領域の間における少なくとも一部の領域におけるキャリアライフタイムが、アノード領域およびカソード領域におけるキャリアライフタイムのいずれよりも長くてよい。
第1のピーク:1〜4MeV(1.5MeV)、3E12〜3E13cm−2(1E13cm−2)
第2のピーク:0.8〜3MeV(1Mev)、1E12〜1E13cm−2(7E12cm−2)
第3のピーク:0.6〜2MeV(0.8MeV)、3E12〜3E13cm−2(1E13cm−2)
第4のピーク:0.2〜1MeV(0.4MeV)、3E13〜1E15cm−2(3E14cm−2)
また、本例におけるFS領域40の各ピーク濃度および裏面からの深さの好ましい範囲は以下である。括弧内は1つの実施例となる値である。また、第2のピーク、第3のピーク、第4のピークは、それより奥のピークにおけるプロトンの通過領域に形成されるので、通過領域のドナー化の影響を受けて、ドナー濃度がかさ上げされる。そのため、例えば第1のピークのプロトンの注入量と、第3のピークのプロトンの注入量を同じとしても、第3のピークは、第1のピークよりもドナー濃度が増加する。第1および第2のピークのプロトンの通過領域のドナー濃度が追加されるからである。
第1のピーク:2E14〜2E15cm−3(9E14cm−3)、15〜150μm(30μm)
第2のピーク:1E14〜1E15cm−3(5E14cm−3)、10〜100μm(15μm)
第3のピーク:3E14〜3E15cm−3(2E15cm−3)、5〜50μm(10μm)
第4のピーク:3E14〜3E16cm−3(5E15cm−3)、1.5〜15μm(3μm)
・半導体基板10の表面(アノード側表面)から3/7までの領域は、順方向電圧Vfの変動はIrpへの影響が大きい。一方、順方向電圧Vfが高くなってもdV/dtは下がる傾向にある。このため、当該領域においては、Irpを小さくするためにキャリアライフタイムが短いことが好ましい。
・半導体基板10の表面から見て3/7から5/7までの領域は、順方向電圧Vfの変動はdV/dtへの影響が大きい。このため、緩やかなdV/dtを実現するために当該領域のキャリアライフタイムは長い方が好ましい。
・半導体基板10の表面から見て5/7から半導体基板10の裏面(カソード側表面)までの領域は、順方向電圧Vfの変動はテール電流への影響が大きい。このため、テール電流を小さくするためにはキャリアライフタイムは短い方がよい。一方、キャリアライフタイムを短くしすぎるとカソード側のキャリアが減少しすぎて、逆回復時に電圧、電流の発振現象を引き起こす場合がある。このため、当該領域のキャリアライフタイムは、3/7から5/7までの領域よりも短く、半導体基板10の表面から3/7までの領域よりも長くてよい。
Claims (10)
- n型の半導体基板と、
前記半導体基板の内部に配置されたn型のドリフト領域と、
前記半導体基板の表面側に形成されたp型のアノード領域と、
前記半導体基板の裏面側においてプロトンをドナーとして形成され、前記ドリフト領域よりもドナー濃度の高いn型のフィールドストップ領域と、
前記フィールドストップ領域よりも前記半導体基板の裏面側に形成されたn型のカソード領域と、
結晶欠陥が前記プロトンの水素で終端されており、前記アノード領域および前記カソード領域よりもキャリアライフタイムが長い第1キャリアライフタイム領域と、
前記プロトンの水素に終端されていない結晶欠陥を含み、前記第1キャリアライフタイム領域よりもキャリアライフタイムが短い第2キャリアライフタイム領域と
を備え、
前記フィールドストップ領域における深さ方向の前記ドナーの濃度分布は、第1のピークと、前記第1のピークよりも前記半導体基板の裏面側において前記第1のピークよりも濃度の低い第2のピークとを有し、
前記第1キャリアライフタイム領域は、前記第1のピークを示す深さ位置を含み、
前記第1のピークを示す深さ位置におけるキャリアライフタイムが長い領域は、前記第1のピークを示す深さ位置よりも前記半導体基板の表面側に延伸する
半導体装置。 - 前記第2キャリアライフタイム領域は、
前記第1キャリアライフタイム領域の前記アノード領域側に隣接したアノード側低ライフタイム領域と、
前記第1キャリアライフタイム領域の前記カソード領域側に隣接したカソード側低ライフタイム領域と、
を備える
請求項1に記載の半導体装置。 - 前記カソード側低ライフタイム領域のキャリアライフタイムよりも、前記アノード側低ライフタイム領域のキャリアライフタイムが低い
請求項2に記載の半導体装置。 - 前記第1キャリアライフタイム領域のキャリアライフタイムが、前記半導体基板の中間でピークを有する
請求項1から3のいずれか一項に記載の半導体装置。 - 前記第1キャリアライフタイム領域は、前記半導体基板の深さ方向の3/7〜5/7に位置する
請求項1から4のいずれか一項に記載の半導体装置。 - 前記半導体基板の裏面側に、前記キャリアライフタイムを短くする局所ライフタイムキラーを有する
請求項1から5のいずれか一項に記載の半導体装置。 - 前記局所ライフタイムキラーが存在する領域は、前記半導体装置の定格逆電圧が印加された場合に、前記アノード領域と前記半導体基板のn型領域との境界から広がる空乏層と接しない位置に形成される
請求項6に記載の半導体装置。 - 前記アノード側低ライフタイム領域は、ヘリウムを含む
請求項2または3に記載の半導体装置。 - 前記ヘリウムの濃度ピークは、前記第1キャリアライフタイム領域のうち前記第1のピークの位置のキャリアライフタイムが前記半導体基板の表面側に延伸する部分に位置する
請求項8に記載の半導体装置。 - 前記半導体基板においてIGBT素子とFWD素子とが一体に設けられたRC−IGBTであり、
前記FWD素子は、前記ドリフト領域と、前記アノード領域と、前記フィールドストップ領域と、前記カソード領域とを有し、
前記IGBT素子は、
前記半導体基板の表面側に設けられたp型領域と、
前記半導体基板の表面から前記p型領域を貫通して前記ドリフト領域まで設けられたトレンチと、
前記トレンチに設けられたトレンチゲートと、
前記トレンチゲートと、前記p型領域および前記ドリフト領域とを絶縁する絶縁膜と、
前記ドリフト領域と、
前記フィールドストップ領域と、
前記フィールドストップ領域の裏面側に設けられたp型のコレクタ領域と
を有する
請求項1から9のいずれか一項に記載の半導体装置。
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