Patent ID: 7605085

Claim:
A method of manufacturing an interconnecting structure, the method comprising: forming a first layer including a first metal wiring and an insulator; forming an etching stopper layer containing nitrogen atoms on said first layer and in contact with said first metal wiring and said insulator; forming an interlayer insulating layer on said etching stopper layer; forming first and second via holes in said interlayer insulating layer, the first via hole reaching said etching stopper layer at a position directly opposite said first metal wiring and the second via hole reaching said etching stopper layer at a position directly opposite said insulator, the second via hole being located near the first via hole; forming a resist pattern of a chemically amplified resist on said interlayer insulating layer and filling the second via hole with resist; forming a groove for a second metal wiring only at an upper portion of the first via hole, remote from said first layer, by etching and removing only part of said interlayer insulating layer at the upper portion, using said resist pattern as an etching mask, the second via hole being located sufficiently near the first via hole so that, in forming the groove, resist poisoning is prevented; and forming the second metal wiring in the groove, a first via in the first via hole as an isolated via, and a dummy via in the second via hole by embedding a metal in the groove and in the first and second via holes, respectively.