Patent ID: 6335275
Filing Date: 2002-01-01
Classification: H01L

Abstract:
A method for forming a contact hole, comprising the steps of:providing a semiconductor substrate; providing an insulating layer on the semiconductor substrate; providing a first silicon system layer on the insulating layer; providing a resist pattern on the first silicon system layer; etching the first silicon system layer using the resist pattern as a mask to form an opening in the first silicon system layer; removing the resist pattern; providing a second silicon system layer to cover the first silicon system layer and the opening; etching the second silicon system layer to form a spacer on an inside wall of the opening, tapered so that the opening has a larger diameter at the top and a smaller diameter at the bottom; providing a protection layer on the spacer; and etching the insulating layer using the first silicon system layer, spacer and protection layer as a mask to form a contact hole therein.