Patent ID: 7176142
Filing Date: 2007-02-13
Classification: H01L

Abstract:
1. A method of manufacturing a trench structure for a device including a trench for an interconnection, comprising the steps of: forming a dielectric film on a substrate; forming a sacrificial film on the dielectric film; forming an etching mask having a prescribed pattern on the sacrificial film; etching the dielectric film though the etching mask to form a via hole in the dielectric film; denaturing the etching mask to form cracks or pores in the etching mask; and treating the substrate with a liquid capable of dissolving the sacrificial film and incapable of dissolving the dielectric film to cause the liquid to permeate into the sacrificial film through the cracks or pores formed in the etching mask, thereby dissolving the sacrificial film by the liquid to separate and remove the etching mask from the dielectric film.