JP7556798B2 - 半導体装置及び半導体パッケージ - Google Patents
半導体装置及び半導体パッケージ Download PDFInfo
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- JP7556798B2 JP7556798B2 JP2021008604A JP2021008604A JP7556798B2 JP 7556798 B2 JP7556798 B2 JP 7556798B2 JP 2021008604 A JP2021008604 A JP 2021008604A JP 2021008604 A JP2021008604 A JP 2021008604A JP 7556798 B2 JP7556798 B2 JP 7556798B2
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Description
以下に、第1実施形態に係る半導体装置(以下「半導体装置DEV1」とする)を説明する。
図1は、半導体装置DEV1の平面図である。図2は、図1のII-IIにおける断面図である。図3は、図2の領域IIIにおける拡大図である。図4は、図1のIV-IVにおける断面図である。図1~図4に示されるように、半導体装置DEV1は、半導体基板SUBと、ゲート絶縁膜GIと、ゲートGAと、層間絶縁膜ILDと、ソース電極EL1と、ゲート電極EL2と、ドレイン電極EL3とを有している。
図5は、半導体装置DEV1の製造方法を示す工程図である。図5に示されるように、半導体装置DEV1の製造方法は、準備工程S1と、エピタキシャル成長工程S2と、第1イオン注入工程S3と、第2イオン注入工程S4と、トレンチ形成工程S5と、ゲート絶縁膜形成工程S6と、ゲート形成工程S7と、層間絶縁膜形成工程S8と、コンタクトプラグ形成工程S9とを有している。半導体装置DEV1の製造方法は、さらに、基板研磨工程S10と、凹部形成工程S11と、第1電極形成工程S12と、第2電極形成工程S13と、個片化工程S14とを有している。なお、第1イオン注入工程S3及び第2イオン注入工程S4は、トレンチ形成工程S5、ゲート絶縁膜形成工程S6及びゲート形成工程S7の後に行われてもよい。
半導体装置DEV1では、凹部RPが形成されている部分において、ドレイン領域DRAの厚さが薄くなっているため、オン抵抗が低減されている。例えば、ドリフト領域DRIの厚さを5μm、ドリフト領域DRIの抵抗率を0.12Ω・cm、ドレイン領域DRAの抵抗率を0.8mΩ・cmとし、凹部RPを形成することによりドレイン領域DRAの厚さを150μmから5μmまで薄くすると、オン抵抗を20パーセント程度低減することができる(ドレイン領域DRAの厚さが150μmである場合のオン抵抗は0.12Ω・cm×5μm+0.8mΩ・cm×150μm≒7.2mΩ・mm2となり、ドレイン領域DRAの厚さを5μmまで減少させた場合のオン抵抗は0.12Ω・cm×5μm+0.8mΩ×5μm≒6.0mΩ・mm2となる)。
図18は、変形例1に係る半導体装置DEV1の断面図である。図18に示されるように、半導体基板SUBには、ゲートトレンチGTRが形成されていなくてもよい。すなわち、半導体装置DEV1は、トレンチゲート型のMOSFETではなく、プレーナゲート型のMOSFETであってもよい。なお、変形例1では、第1面FSに露出しているチャネル領域CH上にゲート絶縁膜GIが配置されており、ゲート絶縁膜GI上にゲートGAが配置されている。
以下に、第2実施形態に係る半導体装置(以下「半導体装置DEV2」とする)を説明する。ここでは、半導体装置DEV1と異なる点を主に説明し、重複する説明は繰り返さないものとする。
図21は、半導体装置DEV2の底面図である。図22は、図21のXXII-XXIIにおける断面図である。図21及び図22に示されるように、半導体装置DEV2は、半導体基板SUBと、ゲート絶縁膜GIと、ゲートGAと、層間絶縁膜ILDと、ソース電極EL1と、ゲート電極EL2と、ドレイン電極EL3とを有している。セル領域R2において、第2面SSには、凹部RPが形成されている。これらの点に関して、半導体装置DEV2の構成は、半導体装置DEV1の構成と共通している。
ソース電極EL1及びゲート電極EL2には、ワイヤボンディングが行われることがある。半導体装置DEV1では、相対的に大きな凹部RPが1つ形成されているため、このワイヤボンディングが行われる際に半導体基板SUBが撓むような荷重が加わり、半導体基板SUBが割れてしまうおそれがある。
図23は、変形例1に係る半導体装置DEV2の底面図である。図23に示されるように、凹部RPは、正方格子状に配列されていなくてもよい。凹部RPは、例えば、千鳥格子状に配列されていてもよい。
以下に、第3実施形態に係る半導体装置(以下「半導体装置DEV3」とする)を説明する。ここでは、半導体装置DEV1と異なる点を主に説明し、重複する説明は繰り返さないものとする。
図26は、半導体装置DEV3の底面図である。図27は、図26のXXVII-XXVIIにおける断面図である。図26及び図27に示されるように、半導体装置DEV3は、半導体基板SUBと、ゲート絶縁膜GIと、ゲートGAと、層間絶縁膜ILDと、ソース電極EL1と、ゲート電極EL2と、ドレイン電極EL3とを有している。これらの点に関して、半導体装置DEV3の構成は、半導体装置DEV1の構成と共通している。
半導体装置DEV3では、溝TRが複数形成されているため、溝TRの間にある第2面SSにより、ワイヤボンディング時に加わる荷重を支持することができる。そのため、半導体装置DEV3によると、ワイヤボンディング時に加わる荷重により半導体基板SUBが割れてしまうことを抑制できる。溝TRの延在方向がゲートトレンチGTRの延在方向に沿っている場合、オン抵抗をさらに低減することができる。
以下に、第4実施形態に係る半導体装置(以下「半導体装置DEV4」とする)を説明する。ここでは、半導体装置DEV1と異なる点を主に説明し、重複する説明は繰り返さないものとする。
図28は、半導体装置DEV4の断面図である。図28に示されるように、半導体装置DEV3は、半導体基板SUBと、ゲート絶縁膜GIと、ゲートGAと、層間絶縁膜ILDと、ソース電極EL1と、ゲート電極EL2と、ドレイン電極EL3とを有している。セル領域R2において、第2面SSには、凹部RPが形成されている。これらの点に関して、半導体装置DEV3の構成は、半導体装置DEV1の構成と共通している。
半導体装置DEV3では、凹部RPに導電体CBが埋め込まれているため、ワイヤボンディング時に加わる荷重は、導電体CBによっても支持される。そのため、半導体装置DEV4によると、ワイヤボンディング時に加わる荷重により半導体基板SUBが割れてしまうことを抑制できる。
以下に、第5実施形態に係る半導体パッケージ(以下「半導体パッケージPKG1」とする)を説明する。
図29は、半導体パッケージPKG1の断面図である。図29に示されるように、半導体パッケージPKG1は、半導体装置DEV1と、リードフレームLFとを有している。リードフレームLFは、ダイパッドDPを有している。ダイパッドDPは、凸部PPを有している。リードフレームLFは、例えば、銅、銅合金等により形成されている。
半導体パッケージPKG1では、ボンディングワイヤBWのソース電極EL1及びゲート電極EL2に対するワイヤボンディングが行われる際の荷重が、凸部PPによっても支持されているため、ワイヤボンディング時に加わる荷重により半導体基板SUBが割れてしまうことを抑制できる。
以下に、第6実施形態に係る半導体パッケージ(以下「半導体パッケージPKG2」とする)を説明する。
図30は、半導体パッケージPKG2の断面図である。図30に示されるように、半導体パッケージPKG1は、半導体装置DEV1と、リードフレームLFとを有している。リードフレームLFは、ダイパッドDPを有している。ダイパッドDPは、第1部分DP1と、第2部分DP2とに分割されている。
半導体パッケージPKG2では、ソース電極EL1及びゲート電極EL2に対するワイヤボンディングが行われないため、ワイヤボンディング時の荷重により半導体基板SUBが割れてしまうことを抑制できる。
Claims (2)
- 第1面と、前記第1面の反対側の第2面とを有する半導体基板と、
前記第1面に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1面上に形成されたゲートと、
前記半導体基板の前記第1面側に形成されたソース領域と、
前記ソース領域に接するように形成され、かつチャネル領域を含むボディ領域と、
前記半導体基板の前記第2面側に形成されたドレイン領域と、
前記ボディ領域の前記第2面側及び前記ドレイン領域の前記第1面側に接するように形成されたドリフト領域とを備え、
前記ゲートは、前記ゲート絶縁膜を介在させて前記チャネル領域と対向しており、
前記半導体基板は、前記第2面において、前記第1面に向かって窪んでいる少なくとも1つの凹部が形成されており、
前記少なくとも1つの凹部は、平面視において格子状に配列されている複数の凹部であり、
前記第1面上に形成され、かつ前記ゲートに電気的に接続されているゲート電極をさらに備え、
前記複数の凹部は、平面視において、前記ゲート電極と重ならない位置にある、半導体装置。 - 第1面と、前記第1面の反対側の第2面とを有する半導体基板と、
前記第1面に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1面上に形成されたゲートと、
前記半導体基板の前記第1面側に形成されたソース領域と、
前記ソース領域に接するように形成され、かつチャネル領域を含むボディ領域と、
前記半導体基板の前記第2面側に形成されたドレイン領域と、
前記ボディ領域の前記第2面側及び前記ドレイン領域の前記第1面側に接するように形成されたドリフト領域とを備え、
前記ゲートは、前記ゲート絶縁膜を介在させて前記チャネル領域と対向しており、
前記半導体基板は、前記第2面において、前記第1面に向かって窪んでいる少なくとも1つの凹部が形成されており、
前記少なくとも1つの凹部は、第1方向に沿って延在しており、かつ前記第1方向に交差している第2方向において互いに間隔を空けて配置されている複数の溝であり、
前記第1面上に形成され、かつ前記ゲートに電気的に接続されているゲート電極をさらに備え、
前記複数の溝は、平面視において、前記ゲート電極と重ならない位置にある、半導体装置。
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CN202111587696.9A CN114784105A (zh) | 2021-01-22 | 2021-12-23 | 半导体器件与半导体封装体 |
TW111100420A TW202245189A (zh) | 2021-01-22 | 2022-01-05 | 半導體裝置及半導體封裝 |
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JP2002016266A (ja) | 2000-06-28 | 2002-01-18 | Sankosha Corp | 半導体素子とその製造方法 |
JP2005294773A (ja) | 2004-04-06 | 2005-10-20 | Renesas Technology Corp | 半導体装置の製造方法 |
JP2013016580A (ja) | 2011-07-01 | 2013-01-24 | Panasonic Corp | 半導体装置及びその製造方法 |
JP2013201413A (ja) | 2012-02-21 | 2013-10-03 | Rohm Co Ltd | 半導体装置および半導体装置の製造方法 |
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