Patent ID: 7256125
Filing Date: 2007-08-14
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: (a) providing a semiconductor substrate; (b) forming an insulating film over the semiconductor substrate; (c) forming a polycrystalline silicon film over the insulating film; (d) forming a W (e) patterning the W (f) after the step (e), performing heat treatment, wherein the step (c) comprises sub-steps of: (c1) forming a second region of the polycrystalline silicon film over the insulating film; and (c2) forming a first region of the polycrystalline silicon film over the second region of the polycrystalline silicon film, with an impurity concentration of the first region of the polycrystalline silicon film being smaller than that of the second region of the polycrystalline silicon film, wherein in the step (d), the W wherein the W