Patent ID: 8043948
Filing Date: 2011-10-25
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method, comprising: forming a conductive film over a substrate; forming an assist pattern on the conductive film; forming a metal film to cover the conductive film and the assist pattern; etching back the metal film to form at least one side wall film which is the metal film on a side surface of the assist pattern; removing the assist pattern after the forming the side wall film; forming at least one resist pattern to selectively expose a portion of the conductive film and a portion of the side wall film, after the removing the assist pattern; performing etching using the resist pattern as a mask to remove the exposed portion of the side wall film; and etching the conductive film using the side wall film as a mask to form a gate electrode and a contact region electrically connected to the gate electrode, wherein a shape of the side wall film left on the conductive film by removing a portion exposed from the resist pattern corresponds to a shape of the gate electrode and a shape of the contact region, and wherein a shape of the assist pattern is in contact with at least three sides of the side wall film corresponding to the shape of the contact region.