Method for forming metal interconnect of semiconductor device

摘要

A method for forming a metal interconnect of a semiconductor device defined by a fine trench or via is disclosed. The method includes forming a first interconnect insulating layer on a substrate. A via hole is formed on a predetermined portion of the first interconnect insulating layer. A second interconnect insulating layer is formed on the first interconnect insulating layer. The second interconnect insulating layer is planarized. A hard mask layer is formed on the second interconnect insulating layer. The hard mask layer is patterned to remove selective portions. A trench is formed by etching the second interconnect insulating layer. A metal interconnect is formed in the trench.