Patent ID: 6794307
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A method of forming a contact opening in an insulative layer formed over a substrate in a semiconductor device, comprising:forming a dielectric antireflective coating layer over said insulative layer; forming a photoresist layer over said coating layer; patterning said photoresist layer to provide an access opening therein for etching; etching a contact opening through said insulative layer using said access opening; removing said photoresist layer; contacting said coating layer with a removal mixture comprising tetramethylammonium fluoride and at least one acid selected from the group consisting of hydrofluoric acid, hydrochloric acid, nitric acid, phosphoric acid, acetic acid, citric acid, sulfuric acid, carbonic acid and ethylenediamine tetraacetic acid, said contacting being sufficient to remove said coating layer.