Patent ID: 6987065
Filing Date: 2006-01-17
Classification: H01L,Y10S

Abstract:
1. A process for manufacturing a semiconductor device comprising the following steps in this order: a conductive film formation step for forming a first conductive film via a gate insulating film on a semiconductor layer provided on a surface of the substrate, the first conductive film having a higher thermal-oxidation rate than that of the semiconductor layer; a pattern formation step for forming a pattern on the first conductive film; a trench formation step for forming an isolation trench by etching the semiconductor layer and the first conductive film using the pattern formed on the first conductive film as a mask; a first insulation film formation step for forming a first insulation film only at sidewalls, which are exposed by the trench, of the semiconductor layer and the first conductive film by thermally oxidizing the sidewalls of the semiconductor layer and the first conductive film; and a gate electrode formation step for forming a gate electrode by etching the first conductive film.