Patent ID: 8563986
Filing Date: 2013-10-22
Classification: H01L

Abstract:
1. A semiconductor switching device, comprising: a wide band-gap drift layer having a first conductivity type; a first wide band-gap well region having a second conductivity type that is opposite the first conductivity type on the wide band-gap drift layer; a second wide band-gap well region having the second conductivity type on the wide band-gap drift layer; a first wide band-gap source/drain region having the first conductivity type on the first wide band-gap well region; a second wide band-gap source/drain region having the first conductivity type on the second wide band-gap well region; a wide band-gap JFET region having the first conductivity type between the first and second well regions; and a gate insulation layer on the JFET region and on the first and second well regions, wherein a first local JFET region of the JFET region that is adjacent a side surface of the first well region and a second local JFET region of the JFET region that is adjacent a side surface of the second well region have doping concentrations that exceed a doping concentration of a central portion of the JFET region that is between the first and second local JFET regions of the JFET region, wherein the portions of the gate insulation layer that are on the first local JFET region, the central portion of the JFET region and the second local JFET region all have substantially the same thickness.