Patent ID: 6867145

Claim:
A method for fabricating a semiconductor device with use of an ArF light source, comprising the steps of: forming an etch stop layer and an insulating layer sequentially on a substrate; forming an anti-reflective coating layer on top of the insulating layer; forming a photoresist pattern on the anti-reflective coating layer by performing a photo-etching process using a photoresist and a ArF light source; exposing the insulating layer by etching the anti-reflective coating layer through the use of the photoresist pattern as an etch mask; etching selectively a partial portion of the exposed insulating layer by using gas including C x F y where x and y are integers ranging from 1 to 10; etching selectively the insulating layer until the partial portion of the insulating layer is remained on top of the etch stop layer by using gas including C x F y and C a H b F c where a, b, and c are integers ranging from 1 to 10; removing the remaining insulating layer by using gas including C x F y ; and removing selectively the etch stop layer and exposing a surface of the substrate so to form a predetermined number of patterns.