Patent ID: 6764957
Filing Date: 2004-07-20
Classification: H01L,Y10T

Abstract:
A method for forming a contact or via plug, comprising:forming a dielectric layer on a substrate; forming a patterned photoresist layer on the dielectric layer; removing a portion of the dielectric layer exposed by the photoresist layer to form a first opening by using the patterned photoresist layer as a mask; forming a first liner on surfaces of the photoresist layer; removing a portion of the dielectric layer under the first opening to form a second opening by using the patterned photoresist layer and the first liner as a mask, wherein the second opening incorporates the first opening; forming a second liner on the photoresist layer covering the first liner; removing a portion the dielectric layer under the second opening to form a third opening exposing the substrate by using the patterned photoresist layer and the second liner as a mask, wherein the third opening incorporates the second opening; removing the second liner, the first liner and the photoresist layer; and filling a conductive material into the third opening to form a contact or via plug.