Patent ID: 8158527
Filing Date: 2012-04-17
Classification: G03F,H01L

Abstract:
1. A semiconductor device fabrication method comprising: forming a second material film over a first material film formed over a work substrate, the first and second material films being different in material; forming a first resist layer over the second material film; performing a first exposure process on the first resist layer to form a first resist pattern of a uniform pattern density, the first resist pattern including a desired pattern and a dummy pattern; forming a second material film pattern by doing anisotropic dry etching of the second material film using the first resist pattern as a mask; removing the first resist pattern; forming a second resist layer to cover the second material film pattern after the first resist pattern is removed; performing a second exposure process on the second resist layer to form a second resist pattern, the second resist pattern covering a first part of the second material film pattern corresponding to the desired pattern; removing a second part of the second material film pattern corresponding to the dummy pattern using the second resist pattern as a mask; removing the second resist pattern; and doing anisotropic dry etching of the first material film using the first part of the second material film pattern as a mask.