Sanken Electric Co., Ltd.

Kazuko Ogawa

Satoshi Kawashiri

A semiconductor device is disclosed that comprises semiconductor regions and an insulating film. A groove extends from a top surface of a semiconductor region and reaching a semiconductor region. In plan view, a body of a bottom electrode is formed in a strip form, and extends in an extending direction of the groove, and the connection portion extends in a depth direction of the groove and is connected to an end of the body in the extending direction of the body. The body of the bottom electrode is arranged in the groove, and the connection portion of the bottom electrode is arranged in the connection groove. In plan view, a length of the groove in the extending direction of the groove is larger than a width of the groove, and the width of the groove is larger than a gap between the groove and an adjacent groove.

Semiconductor device

A semiconductor device includes: a first semiconductor region; a second semiconductor region; a third semiconductor region; a fourth semiconductor region; an insulation film, which is arranged on an inner wall of a recess that extends from an upper surface of the fourth semiconductor region and reaches the second semiconductor region with penetrating the fourth semiconductor region and the third semiconductor region; a control electrode, which is arranged on the insulation film on a side surface of the recess and faces the third semiconductor region; a first main electrode, which is electrically connected to the first semiconductor region, and a second main electrode, which is electrically connected to the fourth semiconductor region, wherein a ratio of a width of the recess to a width of the third semiconductor region contacting the second main electrode is 1 or larger.

A semiconductor device includes: a first semiconductor region; a second semiconductor region, which is arranged on the first semiconductor region; a third semiconductor region, which is arranged on the second semiconductor region; a plurality of fourth semiconductor regions, each of which is arranged with being spaced from each other on the third semiconductor region; a insulation film arranged on a inner wall of a recess, which extends from upper faces of the fourth semiconductor region to pass through the third semiconductor region and the fourth semiconductor region and reaches the second semiconductor region; a control electrode, a first main electrode, a second main electrode, which is electrically connected to the third semiconductor region and the fourth semiconductor region, wherein a ratio of a width of the recess to a width of the third semiconductor region abutting on the second main electrode is 1 or more.

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Niiza, Japan

Kazuko Ogawa