JP6408405B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6408405B2 JP6408405B2 JP2015052245A JP2015052245A JP6408405B2 JP 6408405 B2 JP6408405 B2 JP 6408405B2 JP 2015052245 A JP2015052245 A JP 2015052245A JP 2015052245 A JP2015052245 A JP 2015052245A JP 6408405 B2 JP6408405 B2 JP 6408405B2
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- 239000004065 semiconductor Substances 0.000 title claims description 244
- 230000005684 electric field Effects 0.000 description 23
- 230000015556 catabolic process Effects 0.000 description 17
- 239000012535 impurity Substances 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 8
- 230000010287 polarization Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 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
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Description
このため、終端領域に、半導体領域と、当該半導体領域に接続された電極と、を有する半導体装置において、耐圧の変動を抑制できる技術が求められている。
第1半導体領域は、第1領域と第2領域を有する。第2領域は、第1領域の周りに設けられている。
第2半導体領域は、第1半導体領域の上に設けられている。
第3半導体領域は、第1半導体領域の上に設けられている。
第1電極は、第3半導体領域の上に設けられている。第1電極は、第3半導体領域と電気的に接続されている。
第2電極は、第1電極層と、第2電極層と、を有する。第1電極層は、第2半導体領域の上に設けられ、第2半導体領域と電気的に接続されている。第2電極層は、第1電極層の上に第1絶縁層を介して設けられている。第2電極層は、第1電極の上に位置する第1部分を含む。
第3電極は、第1電極の一部と第1電極層との間に設けられている。第3電極は、第1電極及び前記第1電極層から離間している。第3電極は、第3半導体領域と電気的に接続されている。第1電極の別の一部は、第1部分と3電極との間に位置する。
なお、図面は模式的または概念的なものであり、各部分の厚みと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。また、同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
また、本願明細書と各図において、既に説明したものと同様の要素には同一の符号を付して詳細な説明は適宜省略する。
各実施形態の説明には、XYZ直交座標系を用いる。半導体層Sの主面に対して平行な方向であって相互に直交する2方向をX方向(第3方向)及びY方向(第2方向)とし、これらX方向及びY方向の双方に対して直交する方向をZ方向(第1方向)とする。
以下の説明において、n+、n、n−及びp+、p、p−の表記は、各導電形における不純物濃度の相対的な高低を表す。すなわち、n+はnよりもn形の不純物濃度が相対的に高いことを示し、n−はnよりもn形の不純物濃度が相対的に低いことを示す。また、p+はpよりもp形の不純物濃度が相対的に高く、p−はpよりもp形の不純物濃度が相対的に低いことを示す。
以下で説明する各実施形態について、各半導体領域のp形とn形を反転させて各実施形態を実施してもよい。
第1実施形態に係る半導体装置100について、図1〜図5を用いて説明する。
図1は、第1実施形態に係る半導体装置100を表す平面図である。
図2は、図1のA−A´断面図である。
図3は、図1のB−B´断面図である。
図4は、図1のC−C´断面図である。
図5は、図1のD−D´断面図である。
なお、図1では、複数のゲート電極11の一部を破線で表している。
第1実施形態に係る半導体装置100は、n+形ドレイン領域1と、n−形半導体領域2(第1導電形の第1半導体領域)と、p形ベース領域3(第2導電型の第2半導体領域)と、n+形ソース領域4(第1導電形の第6半導体領域)と、n+形半導体領域5(第1導電形の第3半導体領域)と、ゲート絶縁層11と、ゲート電極10と、フィールドプレート電極13と、絶縁層23と、絶縁層25(第1絶縁層)と、ドレイン電極30と、ソース電極31(第2電極)と、電極33(第1電極)と、電極35(第3電極)と、電極37と、を有する。
第1部分33aの一部は、電極35、第2部分33b、およびn+形半導体領域5に対して、素子領域R1側に設けられている。また、電極35の一部は、n+形半導体領域5に対して素子領域R1側に設けられている。
このため、図2に表すように、距離D1は、距離D3より長く、距離D2より短い。
ゲート電極11、フィールドプレート電極13、および電極35には、例えば、多結晶シリコンが用いられる。
ゲート絶縁層10、絶縁層23、および絶縁層25には、例えば、酸化シリコンが用いられる。絶縁層23および絶縁層25には、他の半導体材料の酸化物または金属材料の酸化物が用いられてもよい。
本実施形態では、終端領域R2に設けられた電極33の上に絶縁層25が設けられ、この絶縁層25の上に、ソース電極31の一部が設けられている。このような構成を採用することで、終端領域における耐圧の変動を抑制することが可能となる。
第2実施形態に係る半導体装置200について、図6および図7を用いて説明する。
図6は、第2実施形態に係る半導体装置200を表す平面図である。
図7は、図6のA−A´断面図である。
図6では、ゲート電極11の一部と、p形半導体領域6と、を破線で表している。
第3実施形態に係る半導体装置300について、図8および図9を用いて説明する。
図8は、第3実施形態に係る半導体装置300を表す平面図である。
図9は、図8のA−A´断面図である。
図8では、半導体装置200の構造の説明のために、p−形半導体領域7が設けられた位置の一部を破線で表している。
第4実施形態に係る半導体装置400について、図10を用いて説明する。
図10は、第4実施形態に係る半導体装置400の一部を表す断面図である。
第4実施形態に係る半導体装置400は、p+形コレクタ領域8と、n形半導体領域1aと、n−形半導体領域2(第1導電形の第1半導体領域)と、p形ベース領域3(第2導電型の第2半導体領域)と、n+形エミッタ領域4(第5半導体領域)と、n+形半導体領域5(第3半導体領域)と、ゲート絶縁層11と、ゲート電極10と、絶縁層23と、絶縁層25(第1絶縁層)と、コレクタ電極30と、エミッタ電極31(第2電極)と、電極33(第1電極)と、電極35と、電極37と、を有する。
第5実施形態に係る半導体装置500について、図11および図12を用いて説明する。
図11は、第5実施形態に係る半導体装置500を表す平面図である。
図12は、図11のA−A´断面図である。
第5実施形態に係る半導体装置500は、n+形半導体領域1と、n−形半導体領域2(第1導電形の第1半導体領域)と、p形半導体領域3(第2導電型の第2半導体領域)と、p+形半導体領域9と、n+形半導体領域5(第3半導体領域)と、絶縁層23と、絶縁層25(第1絶縁層)と、アノード電極30と、カソード電極31(第2電極)と、電極33(第1電極)と、電極35と、を有する。
Claims (7)
- 第1領域と、前記第1領域の周りに設けられた第2領域と、を有する第1導電形の第1半導体領域と、
前記第1領域において前記第1半導体領域の上に設けられた第2導電型の第2半導体領域と、
前記第2領域において前記第1半導体領域の上に設けられた第1導電形の第3半導体領域と、
前記第3半導体領域の上に設けられ、前記第3半導体領域と電気的に接続された第1電極と、
前記第2半導体領域の上に設けられ、前記第2半導体領域と電気的に接続された第1電極層と、
前記第1電極層の上に第1絶縁層を介して設けられた第2電極層と、
を有し、前記第2電極層は前記第1電極の上に位置する第1部分を含む第2電極と、
前記第1電極の一部と前記第1電極層との間に設けられ、前記第1電極及び前記第1電極層から離間し、前記第3半導体領域と電気的に接続された第3電極であって、前記第1電極の別の一部は、前記第1部分と前記第3電極との間に位置する、前記第3電極と、
を備えた半導体装置。
- 前記第1電極の一端は、前記第3電極に対して、前記第1領域側に設けられた請求項1記載の半導体装置。
- 前記第3電極の一端は、前記第3半導体領域に対して、前記第1領域側に設けられた請求項1または2に記載の半導体装置。
- 前記第3半導体領域は、前記第2半導体領域の周りに設けられ、
前記第1電極及び前記第3電極は、前記第1電極層の周りに設けられた請求項1〜3のいずれか1つに記載の半導体装置。 - 前記第2電極層は、前記第1電極層の上に位置する部分を有し、前記第1部分は、前記部分の周りに設けられた請求項4記載の半導体装置。
- 前記第1半導体領域の上に設けられ、前記第2半導体領域の周りに位置し、前記第3半導体領域に囲まれた第2導電形の第4半導体領域をさらに備えた請求項1〜5のいずれか1つに記載の半導体装置。
- 前記第2半導体領域の上に設けられた第1導電形の第5半導体領域と、
ゲート電極と、
少なくとも一部が前記第2半導体領域と前記ゲート電極との間に設けられたゲート絶縁層と、
をさらに備えた請求項1〜6のいずれか1つに記載の半導体装置。
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