Patent ID: 6653243
Filing Date: 2003-11-25
Classification: C11D,H01L

Abstract:
A semiconductor processing method of forming an opening to a copper-containing substrate, comprising:providing a copper-containing substrate having a silicon oxide mass thereover, the copper-containing substrate being supported by a semiconductor material; etching an opening through the mass and to the copper-containing substrate, a surface of the copper-containing substrate forming a base of the opening and thus defining a base surface of the opening, said base surface being at least partially covered by at least one of a copper oxide, a silicon oxide or a copper fluoride; and cleaning said base surface with a cleaning solution formed from hydrochloric acid, nitric acid and hydrofluoric acid to remove at least some of the at least one of a copper oxide, a silicon oxide or a copper fluoride from the base surface, the silicon oxide mass having a surface exposed to the cleaning solution during the cleaning; the cleaning removing less than 5 angstroms of silicon oxide from the silicon oxide mass.