Patent ID: 7718474
Filing Date: 2010-05-18
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a stacked structure in which a first gate insulating film, a first gate electrode film, a second gate insulating film and a second gate electrode film are stacked in this order, on a semiconductor substrate; forming a plurality of mask portions separate from each other on the stacked structure at the same pitch; removing at least one mask portion formed in a predetermined area with mask portions left in areas between which the predetermined area is interposed; forming sidewall portions on opposed side surfaces of a pair of mask portions which are opposed to each other with the predetermined area interposed therebetween; and etching the stacked structure using the mask portions and the sidewall portions as a mask to form a pair of select gate structures under the pair of mask portions and the sidewall portions and form memory cell gate structures under mask portions other than the pair of mask portions.