JP2018156996A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 40
- 239000011229 interlayer Substances 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 13
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
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- 238000006243 chemical reaction Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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Abstract
Description
比較例のRC−IGBTの構成について、IGBTとFWDとを同一半導体チップに内蔵して一体化した活性領域の構成を例に説明する。
図1A、図1Bは、実施の形態1のRC−IGBTの構成例を示す断面図である。図1A、図1Bの記載の半導体装置100のRC−IGBTの基本構造は、比較例に係るRC−IGBTの構造と同じである(図8〜図11参照)。
ここで、ドレイン−ソース間容量Cdsは、FWD領域122にフローティングトレンチ構造116を形成するだけに限らず、IGBT領域121のゲートトレンチ構造106、エミッタトレンチ構造107によっても変化する点を以下に説明する。FWD領域122のエミッタトレンチ構造107をフローティングトレンチ構造116とすることで、Cdsの値が変化する。
α=0:IGBT領域121のトレンチ構造104が全てゲートトレンチ構造106の場合
α=1:IGBT領域121のトレンチ構造104が全てエミッタトレンチ構造107の場合(IGBTとして動作しない)
β=0:FWD領域122のトレンチ構造104が全てエミッタトレンチ構造107の場合(通常のRC−IGBT)
β=1:FWD領域122のトレンチ構造104が全てフローティングトレンチ構造116の場合
γ=0:全てFWD領域122の場合
γ=1:全てIGBT領域121の場合
CdsT=CdsT0×[γ×α+(1−γ)×(1−β)]・・・式1
CdsT/CdsT0≦3/4・・・式2
CdsT/CdsT0≧3/8・・・式3
図7は、実施の形態2のRC−IGBTの構成例を示す断面図である。実施の形態2は、実施の形態1(図1A、図1B)で説明した構成の変形例である。図7に示すように、実施の形態2では、フローティングトレンチ構造116が、IGBT領域121にも設けられる。これにより、更にドレイン−ソース間容量Cdsを少なくし、ターン・オン損失Eonを低減できるようになる。ただし、フローティングトレンチ構造116は、IGBT領域121よりもFWD領域122に多く設けられているとよい。また、実施の形態2のように、IGBT領域121とFWD領域122との境界Oに隣接するIGBT領域121側のトレンチ構造104をフローティングトレンチ構造116としてもよいし、IGBT領域121のその他のトレンチ構造104をフローティングトレンチ構造116としてもよい。
101 n-型ドリフト層
102 n型領域
103 p型ベース領域
104 トレンチ構造
105 絶縁膜
106 ゲートトレンチ構造
106a,107a 終端部
107 エミッタトレンチ構造
108 n+型エミッタ領域
109 層間絶縁膜
110 コンタクトプラグ
111 エミッタ電極
112,112a,112b コンタクトホール
113 トレンチ
114 電極
115 p+型領域
116 フローティングトレンチ構造
121 IGBT領域
122 FWD領域
130 n型フィールドストップ層
131 p+型コレクタ領域
132 n+型カソード領域
133 コレクタ電極
123,423 接続部
400 ゲートランナー
411 ゲート電極
Claims (9)
- 第1導電型のドリフト層となる半導体基板に、絶縁ゲート型バイポーラトランジスタが設けられた第1素子領域と、ダイオードが設けられた第2素子領域とを備えた半導体装置であって、
前記第1素子領域のおもて面側に設けられたゲートトレンチ構造と、
前記第2素子領域のおもて面側に設けられたフローティングトレンチ構造とを更に備え、
前記ゲートトレンチ構造は、内側にゲート電位に基づく電極を有し、
前記フローティングトレンチ構造は、内側にフローティング電位である電極を有する半導体装置。 - 前記ゲートトレンチ構造と前記フローティングトレンチ構造とを含む複数のトレンチ構造が、それぞれ、トレンチと該トレンチの内側に設けられた絶縁膜とを有し、前記電極は該絶縁膜の内側に設けられている請求項1に記載の半導体装置。
- 複数の前記トレンチ構造は、前記第2素子領域のおもて面側に設けられたエミッタトレンチ構造を更に含み、
前記エミッタトレンチ構造は、内側にエミッタ電位に基づく電極を有する請求項2に記載の半導体装置。 - 前記第1素子領域から前記第2素子領域にわたって前記トレンチ構造上に設けられた層間絶縁膜と、該層間絶縁膜上に設けられたエミッタ電極とを更に備え、
前記層間絶縁膜は、コンタクトホールを有し、
前記エミッタトレンチ構造は、その終端部が前記コンタクトホールによりエミッタ電極に接続し、
前記フローティングトレンチ構造は、前記層間絶縁膜により前記エミッタ電極から絶縁されている請求項3に記載の半導体装置。 - 前記半導体基板の裏面にコレクタ電極を更に備え、
前記エミッタトレンチ構造及び前記フローティングトレンチ構造と前記コレクタ電極との間のゲート容量CdsTが、当該半導体装置に前記第1素子領域のみが設けられ、該第1素子領域の前記トレンチ構造が全て前記エミッタトレンチ構造であった場合のゲート容量をCdsT0とすると、CdsT/CdsT0≦3/4である請求項3または4に記載の半導体装置。 - 前記エミッタトレンチ構造または前記フローティングトレンチ構造は、前記第1素子領域にも設けられている請求項3から5のいずれか1項に記載の半導体装置。
- 前記第1素子領域は、該第1素子領域の隣り合う前記トレンチ構造の間に設けられた第2導電型のベース領域と、該ベース領域上に設けられた第1導電型のエミッタ領域とを有する請求項2から6のいずれか1項に記載の半導体装置。
- 前記フローティングトレンチ構造は、前記第1素子領域よりも前記第2素子領域に多く設けられている請求項1から7のいずれか1項に記載の半導体装置。
- 前記ドリフト層の表面側に、前記第1素子領域のみ、または前記第1素子領域から前記第2素子領域にわたって第1導電型で前記ドリフト層よりも不純物濃度が高いチャネルストップ層を更に備える請求項1から8のいずれか1項に記載の半導体装置。
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