Patent ID: 9166018
Filing Date: 2015-10-20
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: a first ion implantation step of implanting a p-type impurity into a surface of a semiconductor wafer to form a p-type impurity region in a surface layer of said semiconductor wafer; a coating step of coating a resist on the surface of the semiconductor wafer where the p-type impurity region is formed; an exposing step of patterning the resist to selectively expose the semiconductor wafer; a second ion implantation step of implanting an n-type impurity into the semiconductor wafer using the resist that remains as a mask to selectively form an n-type impurity region, said n-type impurity region being deeper than the p-type impurity region from the surface of the semiconductor wafer and being adjacent to the p-type impurity region; and a removal step of removing a portion of the semiconductor wafer above the n-type impurity region to expose the n-type impurity region, the removed portion of the semiconductor wafer being a region where the p-type impurity has been implanted in the first ion implantation step.