JP6231396B2 - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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- JP6231396B2 JP6231396B2 JP2014023869A JP2014023869A JP6231396B2 JP 6231396 B2 JP6231396 B2 JP 6231396B2 JP 2014023869 A JP2014023869 A JP 2014023869A JP 2014023869 A JP2014023869 A JP 2014023869A JP 6231396 B2 JP6231396 B2 JP 6231396B2
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- 239000004065 semiconductor Substances 0.000 title claims description 113
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 145
- 239000000758 substrate Substances 0.000 claims description 41
- 239000012535 impurity Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 7
- 210000000746 body region Anatomy 0.000 description 26
- 230000015556 catabolic process Effects 0.000 description 15
- 238000002513 implantation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Description
本明細書または図面に説明した技術要素は、単独であるいは各種の組み合わせによって技術的有用性を発揮するものであり、出願時請求項記載の組み合わせに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。
12:半導体基板
20:MOSFET領域
22:ソース領域
26:ボディ領域
28:ドリフト領域
30:ドレイン領域
32:p型フローティング領域
34:ゲートトレンチ
36:ソース電極
38:ドレイン電極
50:外周領域
54:終端トレンチ
59:境界部p型領域
60:下端p型領域
62:外周p型領域
64:ガードリング領域
70:段差部
Claims (7)
- 半導体基板を有する半導体装置であって、
前記半導体基板内であってその表面に露出しているn型の第1領域と、
前記第1領域の下側に配置されているp型の第2領域と、
前記第2領域の下側に配置されており、前記第2領域によって前記第1領域から分離されているn型の第3領域と、
前記表面に形成されており、前記第1領域及び前記第2領域を貫通して前記第3領域に達する複数のゲートトレンチと、
前記ゲートトレンチ内に配置されている第1絶縁層と、
前記ゲートトレンチ内に配置されており、前記第1絶縁層を介して前記第2領域に対向しているゲート電極と、
前記ゲートトレンチの下端に接するp型の第4領域と、
前記表面に形成されており、前記表面を平面視したときに前記複数のゲートトレンチが形成されている領域の周囲を一巡する終端トレンチと、
前記終端トレンチ内に配置されている第2絶縁層と、
前記終端トレンチの下端に接しており、前記第3領域によって前記第2領域から分離されているp型の下端p型領域と、
前記終端トレンチよりも外周側に形成されており、前記終端トレンチに接しており、前記表面に露出しているp型の外周p型領域と、
前記外周p型領域よりも外周側に形成されており、前記表面に露出しているp型の複数のガードリング領域と、
前記終端トレンチよりも外周側に形成されており、前記第3領域と繋がっており、前記外周p型領域を前記複数のガードリング領域から分離しており、前記複数のガードリング領域を互いから分離しているn型の外周n型領域、
を有し、
前記表面に段差部が形成されていることによって、前記表面が、第1表面と、前記第1表面から突出する第2表面を有しており、
前記終端トレンチが、前記第2表面に形成されており、
前記外周p型領域が、前記第2表面から前記第1表面に跨る範囲に露出しており、
前記複数のガードリング領域が、前記第1表面に露出している、
半導体装置。 - 前記ガードリング領域が、Alを含有する請求項1の半導体装置。
- 半導体基板を有する半導体装置であって、
前記半導体基板内であってその表面に露出しているn型の第1領域と、
前記第1領域の下側に配置されているp型の第2領域と、
前記第2領域の下側に配置されており、前記第2領域によって前記第1領域から分離されているn型の第3領域と、
前記表面に形成されており、前記第1領域及び前記第2領域を貫通して前記第3領域に達する複数のゲートトレンチと、
前記ゲートトレンチ内に配置されている第1絶縁層と、
前記ゲートトレンチ内に配置されており、前記第1絶縁層を介して前記第2領域に対向しているゲート電極と、
前記ゲートトレンチの下端に接するp型の第4領域と、
前記表面に形成されており、前記表面を平面視したときに前記複数のゲートトレンチが形成されている領域の周囲を一巡する終端トレンチと、
前記終端トレンチ内に配置されている第2絶縁層と、
前記終端トレンチの下端に接するp型の下端p型領域と、
前記終端トレンチよりも外周側に形成されており、前記終端トレンチに接しており、前記表面に露出しているp型の外周p型領域と、
前記外周p型領域よりも外周側に形成されており、前記表面に露出しているp型の複数のガードリング領域と、
前記終端トレンチよりも外周側に形成されており、前記第3領域と繋がっており、前記外周p型領域を前記複数のガードリング領域から分離しており、前記複数のガードリング領域を互いから分離しているn型の外周n型領域、
を有し、
前記表面に段差部が形成されていることによって、前記表面が、第1表面と、前記第1表面から突出する第2表面を有しており、
前記終端トレンチが、前記第2表面に形成されており、
前記外周p型領域が、前記第2表面から前記第1表面に跨る範囲に露出しており、
前記複数のガードリング領域が、前記第1表面に露出しており、
前記終端トレンチと前記段差部の間の間隔が、10μm以上である、
半導体装置。 - 半導体基板を有する半導体装置であって、
前記半導体基板内であってその表面に露出しているn型の第1領域と、
前記第1領域の下側に配置されているp型の第2領域と、
前記第2領域の下側に配置されており、前記第2領域によって前記第1領域から分離されているn型の第3領域と、
前記表面に形成されており、前記第1領域及び前記第2領域を貫通して前記第3領域に達する複数のゲートトレンチと、
前記ゲートトレンチ内に配置されている第1絶縁層と、
前記ゲートトレンチ内に配置されており、前記第1絶縁層を介して前記第2領域に対向しているゲート電極と、
前記ゲートトレンチの下端に接するp型の第4領域と、
前記表面に形成されており、前記表面を平面視したときに前記複数のゲートトレンチが形成されている領域の周囲を一巡する終端トレンチと、
前記終端トレンチ内に配置されている第2絶縁層と、
前記終端トレンチの下端に接するp型の下端p型領域と、
前記終端トレンチよりも外周側に形成されており、前記終端トレンチに接しており、前記表面に露出しているp型の外周p型領域と、
前記外周p型領域よりも外周側に形成されており、前記表面に露出しているp型の複数のガードリング領域と、
前記終端トレンチよりも外周側に形成されており、前記第3領域と繋がっており、前記外周p型領域を前記複数のガードリング領域から分離しており、前記複数のガードリング領域を互いから分離しているn型の外周n型領域、
を有し、
前記表面に段差部が形成されていることによって、前記表面が、第1表面と、前記第1表面から突出する第2表面を有しており、
前記終端トレンチが、前記第2表面に形成されており、
前記外周p型領域が、前記第2表面から前記第1表面に跨る範囲に露出しており、
前記複数のガードリング領域が、前記第1表面に露出しており、
前記外周p型領域のうちの外周側の端部であって前記表面に露出する領域が、Alの濃度がBの濃度よりも高いAl高濃度領域であり、前記外周p型領域のうちの前記Al高濃度領域に隣接する領域が、Bの濃度がAlの濃度よりも高いB高濃度領域である、
半導体装置。 - 前記Al高濃度領域の幅が、前記各ガードリング領域の幅よりも広い請求項4の半導体装置。
- 半導体基板を有する半導体装置であって、
前記半導体基板内であってその表面に露出しているn型の第1領域と、
前記第1領域の下側に配置されているp型の第2領域と、
前記第2領域の下側に配置されており、前記第2領域によって前記第1領域から分離されているn型の第3領域と、
前記表面に形成されており、前記第1領域及び前記第2領域を貫通して前記第3領域に達する複数のゲートトレンチと、
前記ゲートトレンチ内に配置されている第1絶縁層と、
前記ゲートトレンチ内に配置されており、前記第1絶縁層を介して前記第2領域に対向しているゲート電極と、
前記ゲートトレンチの下端に接するp型の第4領域と、
前記表面に形成されており、前記表面を平面視したときに前記複数のゲートトレンチが形成されている領域の周囲を一巡する終端トレンチと、
前記終端トレンチ内に配置されている第2絶縁層と、
前記終端トレンチの下端に接するp型の下端p型領域と、
前記終端トレンチよりも外周側に形成されており、前記終端トレンチに接しており、前記表面に露出しているp型の外周p型領域と、
前記外周p型領域よりも外周側に形成されており、前記表面に露出しているp型の複数のガードリング領域と、
前記終端トレンチよりも外周側に形成されており、前記第3領域と繋がっており、前記外周p型領域を前記複数のガードリング領域から分離しており、前記複数のガードリング領域を互いから分離しているn型の外周n型領域、
を有し、
前記表面に段差部が形成されていることによって、前記表面が、第1表面と、前記第1表面から突出する第2表面を有しており、
前記終端トレンチが、前記第2表面に形成されており、
前記外周p型領域が、前記第2表面から前記第1表面に跨る範囲に露出しており、
前記複数のガードリング領域が、前記第1表面に露出しており、
前記下端p型領域の一部が、前記終端トレンチよりも内周側に広がっており、
前記終端トレンチよりも内周側に広がっている前記下端p型領域の前記一部が、前記終端トレンチの下端よりも上側に広がっていない、
半導体装置。 - 半導体基板を有する半導体装置を製造する方法であって、
前記半導体装置が、
前記半導体基板内であってその表面に露出しているn型の第1領域と、
前記第1領域の下側に配置されているp型の第2領域と、
前記第2領域の下側に配置されており、前記第2領域によって前記第1領域から分離されているn型の第3領域と、
前記表面に形成されており、前記第1領域及び前記第2領域を貫通して前記第3領域に達する複数のゲートトレンチと、
前記ゲートトレンチ内に配置されている第1絶縁層と、
前記ゲートトレンチ内に配置されており、前記第1絶縁層を介して前記第2領域に対向しているゲート電極と、
前記ゲートトレンチの下端に接するp型の第4領域と、
前記表面に形成されており、前記表面を平面視したときに前記複数のゲートトレンチが形成されている領域の周囲を一巡する終端トレンチと、
前記終端トレンチ内に配置されている第2絶縁層と、
前記終端トレンチの下端に接するp型の下端p型領域と、
前記終端トレンチよりも外周側に形成されており、前記終端トレンチに接しており、前記表面に露出しているp型の外周p型領域と、
前記外周p型領域よりも外周側に形成されており、前記表面に露出しているp型の複数のガードリング領域と、
前記終端トレンチよりも外周側に形成されており、前記第3領域と繋がっており、前記外周p型領域を前記複数のガードリング領域から分離しており、前記複数のガードリング領域を互いから分離しているn型の外周n型領域、
を有し、
前記表面に段差部が形成されていることによって、前記表面が、第1表面と、前記第1表面から突出する第2表面を有しており、
前記終端トレンチが、前記第2表面に形成されており、
前記外周p型領域が、前記第2表面から前記第1表面に跨る範囲に露出しており、
前記複数のガードリング領域が、前記第1表面に露出しており、
前記方法が、
n型層上にp型層を成長させる工程と、
前記p型層の一部を除去することで、前記n型層が露出している表面と、前記p型層が露出しており、前記n型層が露出している表面よりも突出する表面を形成する工程と、
前記n型層が露出している前記表面から前記p型層が露出している前記表面に跨る範囲にp型不純物を注入することによって、前記外周p型領域を形成する工程と、
前記n型層が露出している前記表面にp型不純物を注入することによって、前記ガードリング領域を形成する工程と、
前記p型層が露出している前記表面に前記終端トレンチを形成する工程、
を有する方法。
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