Patent ID: 7122463
Filing Date: 2006-10-17
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device to fabricate, by performing dry etching, an opening with an aspect ratio of not less than 13 in a first insulating film of an oxide of silicon which is formed on a basic substance so as to reach said basic substance; which comprises the steps of: performing a first etching to form an opening section which reaches a depth where no bowing occurs in said first insulating film; forming a sidewall made of a third insulating film, which has a lower etching rate than said first insulating film, to protect said wall surface wherein said sidewall covers at least a region on said wall surface of said opening section corresponding to an aspect ratio of 2 to 7 when the formation of said opening section is completed; and performing a second etching to form an opening in said opening section by dry etching through at least the first insulating layer to reach a bottom film of a cylindrical capacitor.