Patent ID: 6069396
Filing Date: 2000-05-30
Classification: H01L

Abstract:
A high breakdown voltage semiconductor device comprising:an insulating film;a semi-insulating high resistance film formed on the insulating film;a first semiconductor layer of a first conductivity type formed on the high resistance film;a second semiconductor layer of a second conductivity type formed on a surface of the first semiconductor layer;a third semiconductor layer of the first conductivity type formed on the surface of the first semiconductor layer so as to be apart from the second semiconductor layer, and having an impurity concentration higher than that of the first semiconductor layer; anda resurf layer formed in a region between the second semiconductor layer and the third semiconductor layer on the surface of the first semiconductor layer, and having an impurity concentration lower than that of the second semiconductor layer,wherein the resurf layer has an impurity concentration inclination in which an impurity concentration on a side of the second semiconductor layer is higher than that on a side of the third semiconductor layer.