Patent ID: 8395270

Claim:
An etching composition for an under-bump metallurgy (UBM) layer, the etching composition comprising: about 40% by weight to about 90% by weight of hydrogen peroxide (H 2 O 2 ); about 1% by weight to about 20% by weight of an aqueous basic solution including ammonium hydroxide (NH 4 OH) or tetraalkylammonium hydroxide; about 0.01% by weight to about 10% by weight of an alcohol compound; about 2% by weight to about 30% by weight of an ethylenediamine-based chelating agent; and a nonionic surfactant including a copolymer of polyethylene oxide and polypropylene oxide, or a block copolymer of polyethylene glycol and polypropylene glycol.