Patent ID: 7927952
Filing Date: 2011-04-19
Classification: H01L

Abstract:
1. A method of manufacturing semiconductor devices, comprising: forming an anti-oxidizing layer on a surface of a semiconductor layer of a first conduction type, said anti-oxidizing layer having an aperture only through a region for use in formation of a guard ring layer of a second conduction type; forming said guard ring layer of the second conduction type in the surface of said semiconductor layer of the first conduction type by implanting ions through said aperture of said anti-oxidizing layer into a surface of said semiconductor layer; forming an oxide layer at least in said aperture; forming a base layer of the second conduction type adjacent to said guard ring layer of the second conduction type in the surface of said semiconductor layer of the first conduction type; and forming a diffused layer of the first conduction type through implantation of ions into said base layer of the second conduction type, wherein said oxide layer is formed in said aperture and not formed on said anti-oxidizing layer, and said base layer of the second conduction type is formed adjacent to said guard ring layer of the second conduction type by ion implantation with the oxide layer as a mask.