Patent ID: 8221961

Claim:
A method of manufacturing semiconductor devices, the method comprising: sequentially forming an etch target layer, a chemically amplified photoresist layer, and an Anti-Reflective Coating (ARC) layer over a semiconductor substrate; performing an exposure process in order to form exposure portions in the photoresist layer; performing a thermal process so that a decrosslinking reaction is generated in the ARC layer on the exposure portions; performing a development process in order to form photoresist layer patterns and ARC layer patterns by removing the ARC layer at portions in which the decrosslinking reaction has occurred and the exposure portions; performing a silylation process in order to form silylation patterns on sidewalls of each of the photoresist layer patterns; removing the ARC layer patterns and the photoresist layer patterns; and patterning the etch target layer using the silylation patterns as an etch mask.