JP6958011B2 - 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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- 239000004065 semiconductor Substances 0.000 title claims description 172
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- 238000003860 storage Methods 0.000 claims description 38
- 238000010586 diagram Methods 0.000 description 22
- 238000009826 distribution Methods 0.000 description 20
- 238000009825 accumulation Methods 0.000 description 17
- 239000002019 doping agent Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 239000010703 silicon Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 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
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 150000003609 titanium compounds Chemical class 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
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Description
特許文献1 国際公開第2016/133027号
特許文献2 特開2005−57028号公報
本例では、ベース領域14において、B−B'断面のドーピング濃度分布は、A−A'断面の濃度分布よりも高いピーク(B1)を有する。B−B'断面の高濃度ベース領域14−2のドーピング濃度のピークB1の濃度は、蓄積領域16のピーク濃度よりも高くてよい。一方で、図4の比較例におけるB−B'断面のドーピング濃度分布は、図2のA−A'断面と同様の濃度分布であるため、図2におけるB−B'断面の濃度分布において見られるピーク(B1)を有さない。
本例では、ベース領域14において、D−D'断面のドーピング濃度分布は、C−C'断面のドーピング濃度分布よりも高いピーク(D1)を有する。D−D'断面のドーピング濃度分布におけるピーク(D1)は、コンタクト領域15におけるドーピング濃度分布よりも低い。D−D'断面の高濃度ベース領域14−2のドーピング濃度のピークD1の濃度は、蓄積領域16のピーク濃度よりも高くてよい。一方で、図4の比較例におけるD−D'断面のドーピング濃度分布は、図2のC−C'断面と同様の濃度分布であるため、図2におけるD−D'断面の濃度分布において見られるピーク(D1)を有さない。
Claims (16)
- 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の内部において前記ドリフト領域の上方に設けられ、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域と、
前記半導体基板の内部において前記エミッタ領域と前記ドリフト領域の間に設けられた第2導電型のベース領域と、
前記半導体基板の内部において前記ベース領域と前記ドリフト領域の間に設けられ、前記ドリフト領域よりもドーピング濃度の高い第1導電型の蓄積領域と、
前記半導体基板の上面から前記エミッタ領域、前記ベース領域および前記蓄積領域を貫通して設けられ、前記上面において予め定められた延伸方向に延伸して配置され、内部に導電部が設けられたゲートトレンチ部と、
前記延伸方向と垂直な方向な配列方向において前記ゲートトレンチ部と間隔を有して配置され、前記半導体基板の上面から前記エミッタ領域、前記ベース領域および前記蓄積領域を貫通して設けられ、前記上面において予め定められた延伸方向に延伸して配置され、内部に導電部が設けられたトレンチ部と、
前記延伸方向において前記エミッタ領域と交互に設けられた第2導電型のコンタクト領域と
を備え、
前記エミッタ領域および前記コンタクト領域は、前記半導体基板の上面において、前記ゲートトレンチ部から前記トレンチ部まで設けられ、
前記ベース領域は、前記ゲートトレンチ部に隣接した低濃度ベース領域と、前記低濃度ベース領域と隣接し、前記ゲートトレンチ部から離れて設けられ、前記低濃度ベース領域よりもドーピング濃度の高い高濃度ベース領域と、を前記延伸方向において交互に有し、
前記高濃度ベース領域の少なくとも一部は、前記エミッタ領域の下方に設けられ、
前記低濃度ベース領域の少なくとも一部は、前記コンタクト領域の下方に設けられ、
前記コンタクト領域は、前記高濃度ベース領域と隣接して設けられ、
前記半導体基板の深さ方向の前記高濃度ベース領域の幅は、0.1μmより大きい、
半導体装置。 - 前記コンタクト領域は、前記高濃度ベース領域よりもドーピング濃度が高い
請求項1に記載の半導体装置。 - 前記蓄積領域は、前記蓄積領域が存在する部分と、第1の開口とが延伸方向に交互に配置され、
それぞれの前記第1の開口は、前記エミッタ領域の下方に配置されている
請求項1または2に記載の半導体装置。 - 前記蓄積領域は、前記蓄積領域が存在する部分と、第2の開口とが延伸方向に交互に配置され、
それぞれの前記第2の開口は、前記低濃度ベース領域の下方に配置されている
請求項1または2に記載の半導体装置。 - 前記深さ方向の前記高濃度ベース領域の幅は、前記深さ方向の前記エミッタ領域の幅の1/5以上である、請求項1から4のいずれか一項に記載の半導体装置。
- 前記エミッタ領域の前記延伸方向の幅が、前記コンタクト領域の前記延伸方向の幅よりも大きい、請求項1から5のいずれか一項に記載の半導体装置。
- 前記高濃度ベース領域は、前記低濃度ベース領域よりも前記深さ方向に突出している、請求項1から6のいずれか一項に記載の半導体装置。
- 前記エミッタ領域は、前記高濃度ベース領域と接して設けられる、請求項1から7のいずれか一項に記載の半導体装置。
- 前記高濃度ベース領域は、前記蓄積領域と接して設けられる、請求項4に記載の半導体装置。
- 前記蓄積領域と接する前記低濃度ベース領域の前記延伸方向の幅が、前記蓄積領域と接する前記高濃度ベース領域の前記延伸方向の幅よりも大きい、請求項1または2に記載の半導体装置。
- 前記深さ方向において、前記低濃度ベース領域が前記蓄積領域と前記高濃度ベース領域との間に設けられる、請求項1または2に記載の半導体装置。
- 前記ドリフト領域は、前記第1の開口を通して、前記エミッタ領域の下方で前記高濃度ベース領域と接する、請求項3に記載の半導体装置。
- 前記第1の開口は、前記ゲートトレンチ部から離間して設けられ、
前記ドリフト領域は、前記第1の開口を通して、前記エミッタ領域の下方で前記高濃度ベース領域と接する、請求項12に記載の半導体装置。 - 前記ドリフト領域は、前記第2の開口を通して、前記コンタクト領域の下方で前記低濃度ベース領域と接する、請求項4に記載の半導体装置。
- 前記トレンチ部は、ダミートレンチ部であり、
前記蓄積領域、前記高濃度ベース領域および前記エミッタ領域は、前記ダミートレンチ部に隣接して設けられる、
請求項1から14のいずれか一項に記載の半導体装置。 - 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の内部において前記ドリフト領域の上方に設けられ、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域と、
前記半導体基板の内部において前記エミッタ領域と前記ドリフト領域の間に設けられた第2導電型のベース領域と、
前記半導体基板の内部において前記ベース領域と前記ドリフト領域の間に設けられ、前記ドリフト領域よりもドーピング濃度の高い第1導電型の蓄積領域と、
前記半導体基板の上面から前記エミッタ領域、前記ベース領域および前記蓄積領域を貫通して設けられ、前記上面において予め定められた延伸方向に延伸して配置され、内部に導電部が設けられたゲートトレンチ部と、
前記上面から前記半導体基板の内部まで設けられ、前記延伸方向に延伸して配置されたダミートレンチ部と、
を備え、
前記ベース領域は、前記ゲートトレンチ部に隣接した低濃度ベース領域と、前記低濃度ベース領域と隣接し、前記ゲートトレンチ部から離れて設けられ、前記低濃度ベース領域よりもドーピング濃度の高い高濃度ベース領域と、を有し、
前記高濃度ベース領域は、前記エミッタ領域の下方に設けられ、
前記半導体基板の深さ方向の前記高濃度ベース領域の幅は、0.1μmより大きく、
前記深さ方向において前記ドリフト領域と前記高濃度ベース領域との間に設けられ、前記高濃度ベース領域よりもドーピング濃度の低い第2導電型の中間領域をさらに備え、
前記中間領域、前記高濃度ベース領域、および前記エミッタ領域は、前記ダミートレンチ部に隣接して設けられる、半導体装置。
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