Patent ID: 9177797
Filing Date: 2015-11-03
Classification: H01L

Abstract:
1. A method for patterning a semiconductor device comprising: patterning a dummy layer over a hard mask to form one or more dummy lines; forming a sidewall aligned spacer conformably over the one or more dummy lines and the hard mask; forming a first reverse material layer over the sidewall aligned spacer, wherein a material used for forming the sidewall aligned spacer has a higher selectivity than a material used for forming the first reverse material layer; forming a first photoresist over the first reverse material layer; patterning the first photoresist; selectively etching the first reverse material layer using the first photoresist as a mask, wherein the sidewall aligned spacer is not etched; removing the one or more dummy lines; and patterning the hard mask using the sidewall aligned spacer and the first reverse material layer as a mask.