Patent ID: 6962874

Claim:
A method for fabricating a semiconductor device, the method comprising the steps of: sequentially forming a first anti-reflection layer including no photoactive material and a first photoresist film including silicon/photoactive material on a silicon substrate; exposing and wet-developing the first photoresist film, thereby forming a first image layer having a predetermined shape; sequentially forming a second anti-reflection layer including no photoactive material and a second photoresist film including silicon/photoactive material on an entire surface of the substrate including the first image layer; exposing and wet-developing the second photoresist film, thereby forming a second image layer which opens wider than the first image layer; supplying oxygen plasma to a resultant structure in order to transfer a pattern of the second image layer on the second anti-reflection layer and to transfer a pattern of the first image layer exposed through the second anti-reflection layer on the first anti-reflection layer, thereby forming an opening; forming a metal layer on an entire surface of the substrate including the opening; performing a chemical-mechanical polishing process with respect to the metal layer, thereby forming a metal pattern to fill the opening; and removing the second image layer, the second anti-reflection layer, the first image layer, and the first anti-reflection layer.