Semiconductor device and method for manufacturing same
First Claim
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1. A semiconductor device, comprising:
- a substrate made of silicon carbide and having a first trench formed therein, said first trench opening on a side of one main surface;
a gate insulating film disposed on and in contact with a wall surface of said first trench; and
a gate electrode disposed on and in contact with said gate insulating film, said substrate includinga source region of a first conductivity type including said main surface of said substrate and said wall surface of said first trench,a body region of a second conductivity type making contact with said source region and including said wall surface of said first trench,a drift region of the first conductivity type making contact with said body region and including said wall surface of said first trench, anda pair of deep regions of the second conductivity type making contact with said body region and said source region, and extending to a region deeper than said first trench, wherein said pair of deep regions is disposed at symmetrical positions with respect to a center of said first trench when viewed in cross-section,said first trench being formed such that a distance between said wall surface and said deep region increases with increasing distance from said main surface of said substrate.
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Abstract
A MOSFET includes: a substrate having a first trench formed therein, the first trench opening on a side of one main surface; a gate insulating film; and a gate electrode. The substrate includes an n type source region, a p type body region, an n type drift region, and a p type deep region making contact with the body region and extending to a region deeper than the first trench. The first trench is formed such that a distance between the wall surface and the deep region increases with increasing distance from the main surface of the substrate.
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Citations
11 Claims
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1. A semiconductor device, comprising:
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a substrate made of silicon carbide and having a first trench formed therein, said first trench opening on a side of one main surface; a gate insulating film disposed on and in contact with a wall surface of said first trench; and a gate electrode disposed on and in contact with said gate insulating film, said substrate including a source region of a first conductivity type including said main surface of said substrate and said wall surface of said first trench, a body region of a second conductivity type making contact with said source region and including said wall surface of said first trench, a drift region of the first conductivity type making contact with said body region and including said wall surface of said first trench, and a pair of deep regions of the second conductivity type making contact with said body region and said source region, and extending to a region deeper than said first trench, wherein said pair of deep regions is disposed at symmetrical positions with respect to a center of said first trench when viewed in cross-section, said first trench being formed such that a distance between said wall surface and said deep region increases with increasing distance from said main surface of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification