Patent ID: 7935477

Claim:
A method comprising: providing a substrate; forming a first material layer on the substrate; forming a mask layer on the first material layer; forming an anti-reflective coating layer on the mask layer; forming a first resist pattern on the anti-reflective coating layer, the first resist pattern including a first opening therein, exposing the anti-reflective coating layer; curing the first resist pattern using a hardening process; forming a second resist pattern on the anti-reflective coating layer in the first opening, such that the first resist pattern is not deformed during a lithography process for forming the second resist pattern, the first and second resist patterns forming a second opening therein, exposing the anti-reflective coating layer; forming a silicon-rich top material layer on the anti-reflective coating layer in the second opening; removing the first and second resist patterns; and etching the anti-reflective coating layer and the mask layer.