Patent ID: 6291315
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device comprising:forming a masking insulating film on a main surface of a semiconductor wafer;coating and patterning a resist material on said masking insulating film;patterning said masking insulating film to have an opening, by using said resist material as a mask;removing said resist material on said semiconductor wafer; andforming a trench of a predetermined depth in said opening by dry etching with said masking insulating film as an etching mask, wherein said main surface of said semiconductor wafer, other than a region holding said masking insulating film with said opening thereon, is covered with a preventive insulating film and wherein said preventive insulating film is exposed at a periphery of said main surface of said semiconductor wafer by patterning said masking insulating film.