Patent ID: 6492270
Filing Date: 2002-12-10
Classification: H01L

Abstract:
A method of forming a dual damascene comprising the steps of:providing a substrate having a first metal line formed thereon; forming a dual damascene structure having a trench portion and a via portion over said metal line; forming a thin spacer over the vertical walls of said dual damascene structure; forming seed displacement layer over said thin spacer in said via portion of said dual damascene structures, wherein said forming said seed displacement layer is accomplished by using contact displacement solution comprising CuSO4, HF, potassium hydroxide and glyoxylic acid; depositing a second metal in said via portion to form a metal plug structure, wherein the second metal comprises electroless copper; forming a barrier layer over said metal plug including the inside walls of said trench portion of said dual damascene structure; depositing a third metal over said substrate, including over said trench portion of said dual damascene structure, wherein the third metal comprises physical vapor deposited copper and fills up the trench portion; and removing any excess third metal over said dual damascene structure.