Patent ID: 8110508

Claim:
A method of forming a bump structure, comprising: forming a pad electrically connected to a semiconductor chip on a substrate; forming a passivation layer pattern on the substrate, the passivation layer pattern exposing the pad; forming an under-bump metallurgy (UBM) layer on the passivation layer pattern and on the pad exposed by the passivation layer pattern; forming a conductive bump on the UBM layer; and removing a portion of the UBM layer using the conductive bump as a mask with an etching composition including 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.