Power semiconductor device
First Claim
1. A power semiconductor device comprising:
- an emitter layer of a first conductivity type;
a base layer of a second conductivity type formed so as to be in contact with said emitter layer of said first conductivity type;
a low-resistance layer of said second conductivity type formed above said base layer of said second conductivity type and not in contact with said emitter layer of said first conductivity type, said low-resistance layer having a higher carrier concentration than that of said base layer of said second conductivity type;
an intermediate layer of said first conductivity type formed in a surface of said low-resistance layer of said second conductivity type;
a source layer of said second conductivity type formed in a surface of said intermediate layer of said first conductivity type;
a plurality of trenches formed in said low-resistance layer of said second conductivity type such that a side of each of said trenches is in contact with said intermediate layer of said first conductivity type and said source layer of said second conductivity type;
a gate electrode arranged within each of said trenches via a gate insulating film;
a first main electrode connected to said emitter layer of said first conductivity type; and
a second main electrode connected to said source layer of said second conductivity type,wherein said low-resistance layer surrounds bottom portions of said trenches so as to completely separate said intermediate layer of said first conductivity type from said base layer of said second conductivity type.
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Accused Products
Abstract
In a power semiconductor device, an n-base is formed on a p-emitter layer. On the n-base layer, a p-base layer, an n-emitter layer, and a high-concentration p-layer are formed laterally. In the p-base layer, an n-source layer is formed a specified distance apart from the n-emitter layer. In the n-emitter layer, a p-source layer is formed a specified distance apart from the high-concentration p-layer. A first gate electrode is formed via a first gate insulating film on the region sandwiched by the n-source layer and the n-emitter layer. A second gate electrode is formed via a second gate insulating film on the region sandwiched by the high-concentration p-layer and the p-source layer. On the p-emitter layer, a first main electrode is formed. A second main electrode is formed so as to be in contact with the p-base layer, the n-source layer, and the p-source layer.
133 Citations
7 Claims
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1. A power semiconductor device comprising:
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an emitter layer of a first conductivity type; a base layer of a second conductivity type formed so as to be in contact with said emitter layer of said first conductivity type; a low-resistance layer of said second conductivity type formed above said base layer of said second conductivity type and not in contact with said emitter layer of said first conductivity type, said low-resistance layer having a higher carrier concentration than that of said base layer of said second conductivity type; an intermediate layer of said first conductivity type formed in a surface of said low-resistance layer of said second conductivity type; a source layer of said second conductivity type formed in a surface of said intermediate layer of said first conductivity type; a plurality of trenches formed in said low-resistance layer of said second conductivity type such that a side of each of said trenches is in contact with said intermediate layer of said first conductivity type and said source layer of said second conductivity type; a gate electrode arranged within each of said trenches via a gate insulating film; a first main electrode connected to said emitter layer of said first conductivity type; and a second main electrode connected to said source layer of said second conductivity type, wherein said low-resistance layer surrounds bottom portions of said trenches so as to completely separate said intermediate layer of said first conductivity type from said base layer of said second conductivity type. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification