Patent ID: 6624458
Filing Date: 2003-09-23
Classification: H01L

Abstract:
A semiconductor device, comprising:a substrate; and a ferroelectric capacitor provided over said substrate, said ferroelectric capacitor comprising: a lower electrode, a ferroelectric film provided over said lower electrode, and an upper electrode provided over said ferroelectric film, said upper electrode comprising: a first layer of an oxide having a stoichiometric composition represented by a formula AOx1 by using a compositional parameter x1 and an actual composition represented by a formula AOx2 by using a compositional parameter x2; and a second layer of an oxide provided on said first layer and having a stoichiometric composition represented by a formula BOy1 by using a compositional parameter y1 and an actual compositional represented by a formula BOy2 by using a compositional parameter y2, wherein said first layer is between said lower electrode and said second layer, and there holds a relationship of y2/yI>x2/x1.