RB-IGBT
First Claim
1. An RB-IGBT including an isolation region having a first conductivity type on a side surface of a semiconductor substrate, whereinthe semiconductor substrate includes:
- a drift region having a second conductivity type;
a collector region having the first conductivity type and provided farther downward than the drift region; and
an emitter trench portion provided extending to the drift region in a thickness direction that is from a front surface of the semiconductor substrate to a back surface of the semiconductor substrate, andthe emitter trench portion includes;
an upper portion filled by a trench electrode that is electrically connected to an emitter electrode provided above the semiconductor substrate and an upper trench insulating film that directly contacts a bottom portion and side portions of the trench electrode; and
a lower portion entirely filled by a lower trench insulating film provided below the upper trench insulating film.
1 Assignment
0 Petitions
Accused Products
Abstract
An RB-IGBT is provided that has a new emitter trench structure with improved breakdown voltage achieved by improving the electrical field distribution of the drift region. The RB-IGBT includes an isolation region having a first conductivity type on a side surface of a semiconductor substrate. The semiconductor substrate includes a drift region having a second conductivity type; a collector region having the first conductivity type and provided farther downward than the drift region; and an emitter trench portion provided extending to the drift region in a thickness direction from a front surface to a back surface of the semiconductor substrate. The emitter trench portion includes a trench electrode electrically connected to an emitter electrode provided above the semiconductor substrate; an upper trench insulating film directly contacting a bottom portion and side portions of the trench electrode; and a lower trench insulating film provided below the upper trench insulating film.
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Citations
12 Claims
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1. An RB-IGBT including an isolation region having a first conductivity type on a side surface of a semiconductor substrate, wherein
the semiconductor substrate includes: -
a drift region having a second conductivity type; a collector region having the first conductivity type and provided farther downward than the drift region; and an emitter trench portion provided extending to the drift region in a thickness direction that is from a front surface of the semiconductor substrate to a back surface of the semiconductor substrate, and the emitter trench portion includes; an upper portion filled by a trench electrode that is electrically connected to an emitter electrode provided above the semiconductor substrate and an upper trench insulating film that directly contacts a bottom portion and side portions of the trench electrode; and a lower portion entirely filled by a lower trench insulating film provided below the upper trench insulating film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification