Patent ID: 6197680
Filing Date: 2001-03-06
Classification: H01L

Abstract:
A method of forming a conductive line, comprising:providing a semiconductor substrate;forming a conductive layer on the substrate;performing a first etching step on the conductive layer to form a plurality of conductive lines, wherein the first etching step completely removes a portion of the conductive layer between the conductive lines;performing a second etching step on the plurality of the conductive lines to undercut the plurality of the conductive lines so as to make the plurality of the conductive lines have a smaller bottom and to increase a distance between the two neighboring conductive lines;performing a third etching step to remove a residue produced on the substrate during the first and the second etching steps;forming a dielectric layer to cover the plurality of the conductive lines; andperforming a planarization process on the dielectric layer.