Patent ID: 7368300

Claim:
A method for fabricating a capacitor in a semiconductor device, comprising the steps of: forming a titanium silicide layer over a substrate having a plurality of device elements formed thereon; forming a first thin (Ba,Sr)RuO 3 (BSR) layer as a seed layer for a lower electrode on the titanium silicide layer; applying a thermal treatment to the first thin BSR layer after the first thin BSR layer is formed, wherein applying the thermal treatment includes applying an oxygen thermal treatment for removing organic impurities of the first thin BSR layer and applying a nitrogen thermal treatment for improving crystallinity of the first thin BSR layer; forming a second thin BSR layer for forming the lower electrode on the first thin BSR layer, wherein the lower electrode comprises the first and second thin BSR layers; forming a dielectric layer on the lower electrode by forming a thin film of barium strontium titanate (BST); and forming an upper electrode on the dielectric layer.