JP6179538B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6179538B2 JP6179538B2 JP2015042155A JP2015042155A JP6179538B2 JP 6179538 B2 JP6179538 B2 JP 6179538B2 JP 2015042155 A JP2015042155 A JP 2015042155A JP 2015042155 A JP2015042155 A JP 2015042155A JP 6179538 B2 JP6179538 B2 JP 6179538B2
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- substrate
- semiconductor substrate
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- 239000004065 semiconductor Substances 0.000 title claims description 138
- 239000000758 substrate Substances 0.000 claims description 249
- 229910000679 solder Inorganic materials 0.000 claims description 82
- 229910052751 metal Inorganic materials 0.000 claims description 44
- 239000002184 metal Substances 0.000 claims description 44
- 210000000746 body region Anatomy 0.000 claims description 33
- 239000000969 carrier Substances 0.000 claims description 27
- 239000010410 layer Substances 0.000 description 27
- 239000010949 copper Substances 0.000 description 8
- 230000020169 heat generation Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000000463 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
- 229920005591 polysilicon Polymers 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
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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Description
図1に示すように、第1実施例に係る半導体装置1は、半導体基板20と、半導体基板20の表面23の一部に形成されている表面電極5と、半導体基板20の表面23の他の一部に形成されている表面絶縁膜7と、半導体基板20の裏面24に形成されている裏面電極6を備えている。また、半導体装置1は、表面電極5の表面51にはんだ層40を介して固定されている金属部材50を備えている。
上記実施例では、半導体基板20の基板外側部22にエミッタ領域11が形成されていなかったが、この構成に限定されるものではない。第2実施例では、図4に示すように、半導体基板20の基板外側部22に複数のエミッタ領域11が形成されている。基板外側部22に形成されている複数のゲートトレンチ30のうち一部のゲートトレンチ30に接する範囲にエミッタ領域11が形成されている。基板外側部22に形成されている他の一部のゲートトレンチ30に接する範囲には、エミッタ領域11が形成されていない。よって、基板外側部22におけるエミッタ領域11の密度が、基板内側部21におけるエミッタ領域11の密度より小さい。図4に示す断面図において、基板外側部22における単位面積あたりのエミッタ領域11の数が、基板内側部21における単位面積あたりのエミッタ領域11の数より多い。
上記実施例では、半導体基板20の基板外側部22におけるエミッタ領域11の密度が、基板内側部21におけるエミッタ領域11の密度より小さい構成であった。これによって、基板外側部22から表面電極5に流れるキャリアの密度が、基板内側部21から表面電極5に流れるキャリアの密度より小さくなっていた。しかしながら、基板外側部22と基板内側部21のキャリアの密度が異なる構成は、この構成に限定されるものではない。第3実施例では、図5に示すように、半導体基板20の基板外側部22におけるゲートトレンチ30の密度が、基板内側部21におけるゲートトレンチ30の密度より小さい。図5に示す断面図において、基板外側部22における単位面積あたりのゲートトレンチ30の数が、基板内側部21における単位面積あたりのゲートトレンチ30の数より少ない。図5に示す例では、基板外側部22に1つのゲートトレンチ30のみが形成されているが、この構成に限定されるものではなく、基板外側部22に複数のゲートトレンチ30が形成されていてもよい。基板外側部22に複数のゲートトレンチ30が形成されている場合は、基板外側部22に形成されているゲートトレンチ30とゲートトレンチ30の間隔が、基板内側部21に形成されているゲートトレンチ30とゲートトレンチ30の間隔より大きい。
基板外側部22と基板内側部21のキャリアの密度が異なる構成は、上記実施例に限定されるものではない。第4実施例では、図6に示すように、半導体基板20の基板外側部22におけるボディ領域12が、基板内側部21におけるボディ領域12より半導体基板20の浅い位置まで形成されている。(基板内側部21におけるボディ領域12が、基板外側部22におけるボディ領域12より半導体基板20の深い位置まで形成されている。)基板内側部21におけるボディ領域12と基板外側部22におけるボディ領域12の間に段差が形成されている。基板内側部21におけるボディ領域12の下端が、基板外側部22におけるボディ領域12の下端より下方に突出している。これによって、ドリフト領域15からボディ領域12に流れる正孔が、基板外側部22におけるボディ領域12より基板内側部21におけるボディ領域12に流れやすくなる。そのため、半導体装置1がオンのときに、基板外側部22から表面電極5に流れるキャリアの密度が、基板内側部21から表面電極5に流れるキャリアの密度より小さくなる。これにより、半導体装置1のスイッチング耐量が高まる。
第5実施例では、図7に示すように、半導体基板20の基板外側部22にコレクタ領域13が形成されていない。基板内側部21のみにコレクタ領域13が形成されている。コレクタ領域13は、金属部材50の端部55より内側に形成されている。これによって、半導体基板20の基板外側部22におけるコレクタ領域13の密度が、基板内側部21におけるコレクタ領域13の密度より小さい。そのため、半導体装置1がオンのときに、基板外側部22から表面電極5に流れるキャリアの密度が、基板内側部21から表面電極5に流れるキャリアの密度より小さくなる。あるいは、この構成に限定されるものではなく、基板外側部22の一部にコレクタ領域13が形成されていてもよい。
上記実施例では、半導体基板20に形成されている半導体素子としてIGBTについて説明したが、この構成に限定されるものではない。他の実施例では、図8に示すように、半導体素子としてMOSFET(Metal Oxide Semiconductor Field Effect Transistor)を用いてもよい。また、上記各実施例において、基板外側部22より外側の半導体基板20の構成は特に限定されるものではない。すなわち、外側境界92より外側における構成は特に限定されるものではない。また、金属部材50は、例えば、外部端子に接続されるリードフレームや、リードフレームと半導体基板20の間に配置されるスペーサー等であってもよい。
5 :表面電極
6 :裏面電極
7 :表面絶縁膜
11 :エミッタ領域
12 :ボディ領域
13 :コレクタ領域
14 :コンタクト領域
15 :ドリフト領域
17 :FLR領域
20 :半導体基板
21 :基板内側部
22 :基板外側部
23 :表面
24 :裏面
25 :端部
30 :ゲートトレンチ
31 :ゲート絶縁膜
32 :ゲート電極
33 :層間絶縁膜
40 :はんだ層
41 :はんだ内側部
42 :はんだ外側部
45 :端部
50 :金属部材
51 :表面
55 :端部
60 :接合膜
91 :内側境界
92 :外側境界
421 :表面
Claims (4)
- 半導体基板と、
前記半導体基板の表面に形成されている表面電極と、
前記表面電極の表面にはんだ層を介して固定されている金属部材を備え、
前記はんだ層は、前記半導体基板の表面に沿う方向において前記金属部材の端部より内側に位置しているはんだ内側部と、前記金属部材の端部より外側に位置しているはんだ外側部を備え、
前記半導体基板は、前記はんだ内側部の下方に位置している基板内側部と、前記はんだ外側部の下方に位置している基板外側部を備え、
前記基板外側部から前記表面電極に流れるキャリアの密度が、前記基板内側部から前記表面電極に流れるキャリアの密度より小さく、
前記半導体基板の裏面に露出する範囲にコレクタ領域が形成されており、
前記基板外側部における前記コレクタ領域の密度が、前記基板内側部における前記コレクタ領域の密度より小さい、半導体装置。 - 前記半導体基板の表面から深さ方向に延びる複数のゲートトレンチが前記半導体基板に形成されており、
前記基板外側部における前記ゲートトレンチの密度が、前記基板内側部における前記ゲートトレンチの密度より小さい、請求項1に記載の半導体装置。 - 前記半導体基板の表面に露出する範囲にエミッタ領域が形成されており、
前記基板外側部における前記エミッタ領域の密度が、前記基板内側部における前記エミッタ領域の密度より小さい、請求項1又は2に記載の半導体装置。 - 半導体基板と、
前記半導体基板の表面に形成されている表面電極と、
前記表面電極の表面にはんだ層を介して固定されている金属部材を備え、
前記はんだ層は、前記半導体基板の表面に沿う方向において前記金属部材の端部より内側に位置しているはんだ内側部と、前記金属部材の端部より外側に位置しているはんだ外側部を備え、
前記半導体基板は、前記はんだ内側部の下方に位置している基板内側部と、前記はんだ外側部の下方に位置している基板外側部を備え、
前記基板外側部から前記表面電極に流れるキャリアの密度が、前記基板内側部から前記表面電極に流れるキャリアの密度より小さく、
前記半導体基板の表面から深さ方向に延びる複数のゲートトレンチが前記半導体基板に形成されており、
前記半導体基板の深さ方向に延びるボディ領域が前記ゲートトレンチに接する範囲に形成されており、
前記基板外側部におけるボディ領域が、前記基板内側部におけるボディ領域より前記半導体基板の浅い位置まで形成されている、半導体装置。
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