Patent ID: 9728654
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a first conductive type semiconductor substrate; a first conductive type drift region formed by epitaxial growth over the semiconductor substrate; a first conductive type high resistance layer between the semiconductor substrate and the drift region, having a resistance higher than that of the drift region; a plurality of second conductive type vertical implantation regions formed in the drift region by multistage ion implantation, the second conductive type vertical implantation regions having a prescribed width and being at a prescribed horizontal distance from each other in the drift region, each of the second conductive type vertical implantation regions is a plurality of vertically disposed discrete regions, at least some of which are discontinuous from each other; an anode electrode disposed on a front surface of the drift region opposite to the semiconductor substrate, the anode electrode being in Schottky contact with the drift region and in ohmic contact with the second conductive type vertical implantation regions; and a cathode electrode disposed on a rear surface of the semiconductor substrate opposite to the drift region, the cathode electrode being in ohmic contact with the semiconductor substrate, wherein a depletion layer spreads from each of the second conductive type vertical implantation region, the depletion layer being continuous from the anode electrode to the first conductive type high resistance layer.