Patent ID: 7273781
Filing Date: 2007-09-25
Classification: H01L

Abstract:
1. A method of forming a capacitor of a semiconductor device having a semiconductor substrate on which a layer comprising a contact plug and a interlayer insulating film adjoining the contact plug is formed, the method comprising the steps of: i) forming an etching barrier layer on the layer having the interlayer insulating film and the contact plug, and then forming a mold insulating layer on the etching barrier layer; ii) forming a hole having a sidewall exposing the contact plug by etching the mold insulating layer and the etching barrier layer; iii) forming a first blocking layer on the sidewall of the hole, the first blocking layer being made from a material having a wet etching rate lower than the wet etching rate of the mold insulating layer; iv) forming a metal layer for a storage electrode on surfaces of the first blocking layer and the mold insulating layer and then forming a second blocking layer made from a material identical to that of the first blocking layer on the metal layer; v) removing predetermined portions of the second blocking layer and the metal layer formed on or above the mold insulating layer; vi) forming a storage electrode by removing the mold insulating layer through a wet etching process; vii) forming a dielectric layer on the storage electrode; and viii) forming a plate electrode on the dielectric layer.