Patent ID: 7618859
Filing Date: 2009-11-17
Classification: H01G,H01L

Abstract:
1. A method for fabricating a thin film capacitor comprising steps of: forming a dielectric film over a bottom electrode, the dielectric film being composed of at least Ba, Sr, Ti, and O at prescribed compositions; controlling a deposition condition of a top electrode when forming the top electrode over the dielectric film so as to produce a reduced Ba-I region in the dielectric film, in which region an average concentration of perovskite type Ba cations (Ba-I) is less than an average concentration of non-perovskite type Ba cations (Ba-II), at or near a boundary between the top electrode and the dielectric film; and annealing the thin film capacitor in a temperature range of 100° C. to 900° C. in an oxygen atmosphere after the top electrode is formed.