Semiconductor device having MOSFET of trench structure and method for fabricating the same
First Claim
1. A semiconductor device comprising:
- a semiconductor layer;
at least one recessed trench formed in the semiconductor layer so as to define transistor cells of a trench structure;
a gate oxide film extending along a bottom and side walls of the recessed trench;
a gate electrode disposed inside the recessed trench;
a gate pad disposed continuously to the gate electrode; and
a gate wiring comprised of a metal film, the gate wiring being in contact with the gate pad, wherein the gate pad is disposed inside a recessed part formed in a same depth as the recessed trench and the gate wiring is in contact with the gate pad inside the recessed part.
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Accused Products
Abstract
A semiconductor device has a cell region where transistor cells of a trench structure are arranged in a matrix form, in which a recessed trench is formed in a semiconductor layer, a gate oxide film is formed inside the recessed trench, and a gate electrode formed of polysilicon is disposed inside the recessed trench. To have contact with a gate wiring formed of a metal film, a gate pad disposed continuously to the gate electrode is placed inside a recessed part formed in the same depth as the recessed trench. Consequently, many transistor cells of the trench structure are formed in a matrix form. Even in a semiconductor device where the gate wiring formed of a metal film is contacted with the gate electrode, a semiconductor device of a structure allowing gate voltage to be increased sufficiently can be obtained.
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Citations
8 Claims
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1. A semiconductor device comprising:
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a semiconductor layer;
at least one recessed trench formed in the semiconductor layer so as to define transistor cells of a trench structure;
a gate oxide film extending along a bottom and side walls of the recessed trench;
a gate electrode disposed inside the recessed trench;
a gate pad disposed continuously to the gate electrode; and
a gate wiring comprised of a metal film, the gate wiring being in contact with the gate pad, wherein the gate pad is disposed inside a recessed part formed in a same depth as the recessed trench and the gate wiring is in contact with the gate pad inside the recessed part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification