Patent ID: 8207574
Filing Date: 2012-06-26
Classification: H01L

Abstract:
1. A semiconductor device comprising: a nitride-based semiconductor layer having a concave portion formed in a part of one principal surface, a side surface of the concave portion being slanted; a first electrode provided on the principal surface; a second electrode on an opposite side to the first electrode across the concave portion, and provided on the principal surface; an insulating layer formed on both sides of the concave portion in the principal surface, having a slanted wall surface on a concave portion-side; and a control electrode provided on a bottom and a side surface of the concave portion and at least a part of the wall surface of the insulating layer on the concave portion-side, wherein a tilt angle relative to the horizontal axis of the wall surface of the insulating layer is greater than a tilt angle relative to the horizontal axis of the side surface of the concave portion on a same side as the tilt angle of the wall surface of the insulating layer.