Patent ID: 6706642
Filing Date: 2004-03-16
Classification: H01L

Abstract:
A method for fabricating semiconductor capacitors, which comprises the steps of:forming a cylinder type polycrystalline silicon pattern on a semiconductor substrate; forming an amorphous metal film on the substrate in such a manner that the amorphous metal film covers the polycrystalline silicon pattern; crystallizing the amorphous metal film so as to form grown metal grains and grain boundaries between the metal grains; firstly etching the crystallized metal film by a wet etching process in such a manner that the polycrystalline silicon pattern is selectively exposed due to the difference in the wet etching rate between the metal grains and the grain boundary; secondly etching the exposed portion of the polycrystalline silicon pattern by a wet etching process so as to form a storage node electrode whose surface has hemispherical grooves; and successively forming a dielectric layer and a plate electrode on the resulting structure in such a manner that they cover the storage node electrode.