JP7224247B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7224247B2 JP7224247B2 JP2019123484A JP2019123484A JP7224247B2 JP 7224247 B2 JP7224247 B2 JP 7224247B2 JP 2019123484 A JP2019123484 A JP 2019123484A JP 2019123484 A JP2019123484 A JP 2019123484A JP 7224247 B2 JP7224247 B2 JP 7224247B2
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- 239000004065 semiconductor Substances 0.000 title claims description 269
- 239000000758 substrate Substances 0.000 claims description 59
- 239000011229 interlayer Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000007547 defect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 210000000746 body region Anatomy 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
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Description
図1及び図2を参照して、本実施の形態の半導体装置1を説明する。半導体装置1は、例えば、パワー半導体装置である。半導体装置1は、半導体基板2と、おもて側電極18と、裏側電極19とを主に備える。
図4に示されるように、n-型の半導体基板2のおもて面2aからp型不純物をドープして、第1p領域11aと第2p領域11bとを形成する。第1p領域11aと第2p領域11bとは、第1セル領域3aと第2セル領域3bとの間の境界において、互いに分離されている。半導体基板2のうち、第1p領域11a及び第2p領域11bが形成されていない部分が、n-領域10となる。図5に示されるように、半導体基板2のおもて面2aからn型不純物をドープして、第1p領域11a及び第2p領域11b内に、n+ソース領域12を形成する。図6に示されるように、半導体基板2のおもて面2aの一部をエッチングして、トレンチ14を形成する。図7に示されるように、半導体基板2のトレンチ14の表面を酸化して、トレンチ14の底面及び側面上にゲート絶縁膜15を形成する。
半導体装置1では、複数のセル領域の一つ(例えば、第2セル領域3b)のみが欠陥22を含んでおり、複数のセル領域の残り(例えば、第1セル領域3a、第3セル領域3c)には欠陥22がないと仮定する。図10に示される回路を用いて、半導体装置1の複数のセル領域(例えば、第1セル領域3a、第2セル領域3b、第3セル領域3c)の各々の特性が測定される。例えば、おもて側電極18と裏側電極19とを電源27に接続して、おもて側電極18と裏側電極19との間に電圧を印加する。複数のセル領域の一つ(例えば、第2セル領域3b(第2半導体素子4bの第2電極18b))にのみ電流計28を接続して、複数のセル領域の一つ(例えば、第2セル領域3b)に発生するリーク電流を測定する。こうして、複数のセル領域の一つの特性が測定される。
本実施の形態の半導体装置1は、半導体基板2と、おもて側電極18と、裏側電極19とを備える。半導体基板2は、おもて面2aと、裏面2bとを有する。おもて側電極18は、半導体基板2のおもて面2a上に設けられている。裏側電極19は、半導体基板2の裏面2b上に設けられている。半導体基板2は、第1セル領域3aと、第1セル領域3aに隣り合う第2セル領域3bとを含む。第1セル領域3aには、第1半導体素子4aが形成されている。第2セル領域3bには、第2半導体素子4bが形成されている。おもて側電極18は、第1セル領域3aに形成されている第1電極18aと、第2セル領域3bに形成されている第2電極18bとを含む。第1半導体素子4aは、第1電極18aと、第1セル領域3aのおもて面2a側に形成されている第1p領域11aとを含む。第2半導体素子4bは、第2電極18bと、第2セル領域3bのおもて面2a側に形成されている第2p領域11bとを含む。第1電極18aと第2電極18bとは、互いに分離されている。第1半導体素子4aの第1p領域11aと第2半導体素子4bの第2p領域11bとは、互いに分離されている。
図11を参照して、実施の形態2の半導体装置1bを説明する。本実施の形態の半導体装置1bは、実施の形態1の半導体装置1と同様の構成を備えるが、主に以下の点で異なる。
半導体装置1bの特性を測定するために、おもて側電極18と裏側電極19との間に電圧が印加されると、互いに隣り合うセル領域(例えば、第1セル領域3a及び第2セル領域3b)から空乏領域21が拡がる。もし、互いに隣り合うセル領域(例えば、第1セル領域3a及び第2セル領域3b)から拡がった空乏領域21が互いに重なると、複数のセル領域の一つ(例えば、第2セル領域3b)で発生したリーク電流は、複数のセル領域の残り(例えば、第1セル領域3a)に流れ込んでしまう。
図13から図16を参照して、実施の形態3の半導体装置1cを説明する。本実施の形態の半導体装置1cは、実施の形態1の半導体装置1と同様の構成を備えるが、主に以下の点で異なる。
図17及び図18を参照して、実施の形態4の半導体装置1dを説明する。本実施の形態の半導体装置1dは、実施の形態1の半導体装置1と同様の構成を備え、同様の効果を奏するが、主に以下の点で異なる。
図19から図25を参照して、実施の形態5の半導体装置1eを説明する。本実施の形態の半導体装置1eは、実施の形態3の半導体装置1cと同様の構成を備えるが、主に以下の点で異なる。
図26及び図27を参照して、実施の形態6の半導体装置1fを説明する。本実施の形態の半導体装置1fは、実施の形態4の半導体装置1dと同様の構成を備え、同様の効果を奏するが、主に以下の点で異なる。
Claims (5)
- おもて面と裏面とを有する半導体基板と、
前記おもて面上に設けられているおもて側電極と、
前記おもて面上に設けられている層間絶縁膜と、
前記裏面上に設けられている裏側電極とを備え、
前記半導体基板は、第1セル領域と、前記第1セル領域に隣り合う第2セル領域とを含み、
前記第1セル領域には、第1半導体素子が形成されており、
前記第2セル領域には、第2半導体素子が形成されており、
前記おもて側電極は、前記第1セル領域に形成されている第1電極と、前記第2セル領域に形成されている第2電極とを含み、
前記第1半導体素子は、前記第1電極と、前記第1セル領域の前記おもて面側に形成されている第1p領域とを含み、
前記第2半導体素子は、前記第2電極と、前記第2セル領域の前記おもて面側に形成されている第2p領域とを含み、
前記第1電極と前記第2電極とは互いに分離されており、
前記第1p領域と前記第2p領域とは、互いに分離され、
前記第1半導体素子は、前記第2セル領域に最も近い第1ゲート電極を有し、
前記第2半導体素子は、前記第1ゲート電極に最も近い第2ゲート電極を有し、
前記層間絶縁膜は、前記第1ゲート電極と前記第2ゲート電極とを覆うように、前記第1セル領域と前記第2セル領域とにまたがって、前記おもて側電極と前記第1ゲート電極および前記第2ゲート電極との間に配置されている、半導体装置。 - 前記第1半導体素子は、トレンチゲート構造の第1トランジスタであり、
前記第2半導体素子は、トレンチゲート構造の第2トランジスタである、請求項1に記載の半導体装置。 - 前記第1半導体素子は、プレーナゲート構造の第1トランジスタであり、
前記第2半導体素子は、プレーナゲート構造の第2トランジスタである、請求項1に記載の半導体装置。 - 前記第1ゲート電極と前記第2ゲート電極とに導通するゲート配線をさらに備え、
前記半導体基板の前記おもて面の平面視において、前記ゲート配線は、前記第1セル領域と前記第2セル領域との間の境界上に設けられている、請求項2または請求項3に記載の半導体装置。 - 前記半導体基板は、前記半導体基板の前記おもて面の平面視において、前記第1半導体素子の前記第1p領域と前記第2半導体素子の前記第2p領域との間に設けられているn+領域をさらに含み、
前記n+領域は、前記第1p領域及び前記第2p領域から離間されている、請求項1から請求項4のいずれか一項に記載の半導体装置。
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