Patent ID: 6326312
Filing Date: 2001-12-04
Classification: H01L

Abstract:
A method for forming a contact hole of a semiconductor device, comprising the steps of:forming a conductive layer on a semiconductor substrate, and subsequently a first mask pattern directly on top of the conductive layer;selectively eliminating the conductive layer making use of the first mask pattern as a mask, forming a lower line;removing the first mask pattern, and forming an insulating layer on the whole surface of the semiconductor substrate including the lower line;forming a second mask pattern on the insulating layer;etching the insulating layer to a specified depth making use of the second mask pattern as a mask, accumulating a polymer layer on the lateral sides of and on the lower part of the etched insulating layer, thereby forming the upper part of the contact hole having a first slope; andforming a lower part of the contact hole having a second slope, making use of the polymer and the second mask pattern as a mask, thereby exposing a defined portion of the surface on the semiconductor substrate.