Semiconductor device with a gate electrode positioned in a semiconductor substrate
First Claim
1. A semiconductor device comprising:
- a semiconductor substrate;
a trench provided in a front surface of the semiconductor substrate;
a gate insulating film covering an inner surface of the trench; and
a gate electrode provided on an inner side of the gate insulating film, the gate electrode including a first layer and a second layer,whereinthe first layer includes an outer portion of a front surface of the gate electrode,the second layer includes a middle portion of the front surface,the front surface of the gate electrode is provided at a position deeper than the front surface of the semiconductor substrate, and the middle portion of the front surface, which is located at a center in a width direction of the trench, is provided at a position shallower than the outer portion of the front surface, which is in contact with the gate insulating film,the middle portion and the outer portion form a single, continuous surface, of the front surface, andthe outer portion is provided at a depth within 400 nm from the front surface of the semiconductor substrate.
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Accused Products
Abstract
Technique disclosed herein can suppress performance variation among semiconductor devices to be manufactured upon manufacturing each semiconductor device by forming diffusion layer by ion implantation to semiconductor substrate after etching. A semiconductor device includes a semiconductor substrate. The semiconductor substrate includes an emitter region, a top body region, a barrier region, a bottom body region, a drift region, a collector region, a trench, a gate insulating film, and a gate electrode. A front surface of the gate electrode is provided at a deeper position than a front surface of the semiconductor substrate. Within the gate electrode, a front surface of a first portion at a widthwise center of a trench is provided at a shallower position than a front surface of a second portion in contact with the gate insulating film.
9 Citations
5 Claims
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1. A semiconductor device comprising:
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a semiconductor substrate; a trench provided in a front surface of the semiconductor substrate; a gate insulating film covering an inner surface of the trench; and a gate electrode provided on an inner side of the gate insulating film, the gate electrode including a first layer and a second layer, wherein the first layer includes an outer portion of a front surface of the gate electrode, the second layer includes a middle portion of the front surface, the front surface of the gate electrode is provided at a position deeper than the front surface of the semiconductor substrate, and the middle portion of the front surface, which is located at a center in a width direction of the trench, is provided at a position shallower than the outer portion of the front surface, which is in contact with the gate insulating film, the middle portion and the outer portion form a single, continuous surface, of the front surface, and the outer portion is provided at a depth within 400 nm from the front surface of the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5)
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Specification