Patent ID: 7358127
Filing Date: 2008-04-15
Classification: H01L,Y02E

Abstract:
1. A method of manufacturing a semiconductor device comprising the steps of: providing a semiconductor substrate of a first conductivity type as a first semiconductor layer; forming a second semiconductor layer of a second conductivity type on a first principal surface of the first semiconductor layer; implanting light ions into the first semiconductor layer by penetrating into one of the first semiconductor layer or the second semiconductor layer with light ions; thinning a second principal surface of the first semiconductor layer; implanting on the thinned second principal surface of the first semiconductor layer with impurity ions of the first conductivity type; and heat treating to form a third semiconductor layer with an ion-implanted layer on the second principal surface of the first semiconductor layer, and to electrically activate a region implanted with the light ions in the first semiconductor layer between the second semiconductor layer and the third semiconductor layer.