Patent ID: 6461796
Filing Date: 2002-10-08
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming a first resist mask having an opening portion of a specific pattern on a semiconductor substrate, said opening portion having a side wall formed with a taper portion; forming a water-soluble resist film on said first resist mask in such a manner as to cover at least said taper portion, said water-soluble resist film being made water-insoluble when it reacts with acid; allowing said water-soluble resist film to react with acid, to form a water-insoluble portion on said taper portion; removing said water-soluble resist film while leaving said water-insoluble portion, to form a second resist mask composed of said water-insoluble portion formed on said taper portion and said first resist mask; and implanting an impurity in said semiconductor substrate via said second resist mask, to form an impurity region in said semiconductor substrate.