Patent ID: 8193561
Filing Date: 2012-06-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a hetero structure formed by laying a first semiconductor layer within which a flow path of carriers is formed and a second semiconductor layer made of a material different from that of the first semiconductor layer and laid on the first semiconductor layer; and an electrode penetrating through the second semiconductor layer, held in contact with the flow path of carriers and tapered so as to make the cross-sectional area parallel to the hetero interface of the hetero structure larger at the side of the second semiconductor layer than at the side of the first semiconductor layer, the device showing relationships of 0°<ø≦60° and ø≠ø, where θ is the acute angle formed by the tangent plane of the lateral surface of the electrode and the hetero interface at a position where the electrode contacts the flow path of charge carriers and ø is the acute angle formed by the tangent plane of the lateral surface of the electrode and the hetero interface at a position where the electrode contacts the second semiconductor layer above the position where the electrode contacts the flow path of charge carriers on respective cross sections taken along the flow direction of charge carriers.