Patent ID: 6797551
Filing Date: 2004-09-28
Classification: H01L

Abstract:
A method for fabricating a semiconductor device comprising:forming an etching mask having an opening on a semiconductor substrate; forming a trench in the semiconductor substrate; filling the trench with an isolation insulator so as to form an active region in the semiconductor substrate surrounded by the isolation insulator; making an upper face of the isolation insulator equal to a height of a surface of the semiconductor substrate; filling the opening of the etching mask with a field insulator so as to dispose the field insulator on the isolation insulator; removing the etching mask; forming an isolation-sidewall insulator at an inner side face of the field insulator, forming an interlevel insulating film having an etching rate larger than that of the isolation-sidewall insulator on an entire surface; forming an opening for exposing the active region in the interlevel insulating film; and forming a conductor in the opening and electrically connecting the conductor to the active region.