Patent ID: 7550357
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A fabricating method for a semiconductor device comprising: selectively forming a field oxide film and an insulation film on a circuit forming surface of a semiconductor substrate; sequentially forming a gate electrode film and then an oxide film on a surface of said field oxide film and the insulation film; forming a resist pattern having a predetermined geometry on said oxide film by photolithography; using said resist pattern as a mask, etching said oxide film and said gate electrode film to form a gate electrode; using said resist pattern as a mask, etching off a wall face of said oxide film by a predetermined dimension; using said resist pattern as a mask, performing ion implantation into the circuit forming surface of said semiconductor substrate to form a first diffusion layer of a high concentration; and removing said resist pattern, and using said oxide film as a mask, performing ion implantation into the circuit forming surface of said semiconductor substrate to form a second diffusion layer of a low concentration.