Patent ID: 7034376
Filing Date: 2006-04-25
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first general conductivity type having a first resistivity; a first semiconductor layer of the first general conductivity type disposed directly on the substrate and having a second resistivity; a second semiconductor layer of the first general conductivity type disposed on the first semiconductor layer and having a third resistivity; a plurality of semiconductor regions of a second general conductivity type disposed in the first and second semiconductor layers, the semiconductor regions not completely penetrating the first semiconductor layer; and a metal layer disposed on the second semiconductor layer so as to form a Schottky junction with the second semiconductor layer and to be in contact with the semiconductor regions, wherein the semiconductor regions are arranged so that depletion layers extending from the semiconductor regions under an application of a reverse voltage fill the second semiconductor layer between the semiconductor regions, and the third resistivity is higher than the first resistivity and lower than the second resistivity.