Patent ID: 6361712
Filing Date: 2002-03-26
Classification: C11D,C23G,G03F,H01L

Abstract:
A composition for selective etching of oxides over a metal comprising:(a) water; (b) hydroxylammonium salt in an amount about 0.1 wt. % to about 0.5 wt. % of said composition; (c) carboxylic acid selected from the group consisting of: formic acid, acetic acid, propionic acid, valeric acid, isovaleric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, fimaric acid, phthalic acid, 1,2,3-benzenetricarboxylic acid, glycolic acid, lactic acid, citric acid, salicylic acid, tartaric acid, gluconic acid, and mixtures thereof; (d) a fluorine-containing compound; and (e) optionally, base.