Patent ID: 8202443

Claim:
A method of manufacturing a capacitor, comprising the steps of: forming a barrier film and a capacitor oxide film over a semiconductor substrate having an interlayer insulating film containing storage node contact plugs; forming a trench by etching the capacitor oxide film and the barrier film to expose the storage node contact plugs; forming a lower electrode used for a storage node inside the trench, thereby covering the capacitor oxide film; forming an isolated lower electrode by removing a portion of the lower electrode until the capacitor oxide film is exposed; removing the capacitor oxide film to expose the isolated lower electrode with an etching composition comprising hydrofluoric acid (HF), an alkyl ammonium fluoride (R e NH 4 F), a surfactant comprising a compound selected from the group consisting of Formula 1 and Formula 2, an alcohol compound, and water, wherein R e is a C 1 ˜C 10 linear or branched alkyl; rinsing the semiconductor substrate comprising the isolated lower electrode with an alcohol; and, drying the semiconductor substrate comprising the isolated lower electrode; wherein R is a C 8 -C 20 alkyl radical or a C 6 -C 20 aromatic ring; x, y, and z are independently integers ranging from 0 to 10; n is an integer ranging from 3 to 50; and the average molecular weight of the compound according to Formula 1 ranges from 1,000 to 10,000, wherein m is an integer ranging from 3 to 50; and the average molecular weight of the compound according to Formula 2 ranges from 1,000 to 10,000.