Patent ID: 7361547

Claim:
A method for forming a capacitor for use in a semiconductor device having electrode plugs, the electrode plugs being surrounded by an insulating film and connected to underlying contact pads, the method comprising: sequentially forming an etch stop film and a mold oxide film on the insulating film and the electrode plugs; forming recesses in portions of the mold oxide film and the etch stop film, the recesses exposing the electrode plugs, wherein the mold oxide film and etch stop film are vertically aligned after the recesses are formed; forming storage node electrodes in the recesses; filling the recesses in which the storage node electrodes are formed with an artificial oxide film; planarizing the storage node electrodes and the artificial oxide film to expose a planarized surface of the artificial oxide film between adjacent portions of the storage node electrodes and to separate the storage node electrodes from one another; and selectively removing the mold and artificial oxide films using a diluted hydrofluoric acid (DHF) solution having a higher etch rate for the mold and artificial oxide films than for the etch stop film, wherein: the DHF solution has an HF concentration of about 4.5 wt % to about 30 wt %, and the DHF solution further includes a surface active agent.