Patent ID: 7629226
Filing Date: 2009-12-08
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor, said semiconductor comprising a first main electrode provided on a first main surface of a semiconductor substrate, a second main electrode provided on a second main surface of said semiconductor substrate, and at least one trench-type gate electrode provided in a surface of said first main surface, wherein a main current flows in a direction of the thickness of said semiconductor substrate, said manufacturing method comprising: (a) forming at least one trench in a surface of said second main surface after forming the structure on the side of said first main surface in a semiconductor wafer state; (b) in said semiconductor wafer state, forming an insulator layer or a semiconductor layer of a conductivity type reverse to that of said semiconductor substrate entirely on said second main surface to fill said insulator layer or said semiconductor layer inside said at least one trench; and (c) removing said insulator layer or said semiconductor layer on said second main surface to obtain at least one trench isolation structure.