Patent ID: 6297139
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A method of forming a contact hole on a semiconductor wafer, the semiconductor wafer comprising a substrate, a conductive layer positioned in a predetermined area on the surface of the substrate, a dielectric layer positioned on the conductive layer, the method comprising:forming an amorphous silicon layer with an opening on the surface of the dielectric layer wherein the opening is positioned directly above the conductive layer and penetrates to the surface of the dielectric layer;forming a polysilicon layer uniformly on the surface of the amorphous silicon layer, and on walls within the opening so as to reduce the size of the opening;performing a dry etching process to form a contact hole in the dielectric layer, the amorphous silicon layer and the polysilicon layer being used as a hard mask, the contact hole penetrating through the dielectric layer down to the of conductive.