Patent ID: 8906704
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method for manufacturing a ferroelectric capacitor comprising: forming a lower electrode film above a substrate; forming a ferroelectric film that includes a perovskite-type ferroelectric material above the lower electrode film; forming an amorphous intermediate film that includes a perovskite-type conductive oxide above the ferroelectric film; forming a first upper electrode film, that has a columnar crystal structure, comprising an oxide of at least one metal selected from a group consisting of Pt, Pd, Rh, Ir, Ru, and Os, above the intermediate film at a first temperature; carrying out a first heat treatment to the ferroelectric film and the intermediate film in an atmosphere containing an oxidizing gas after the formation of the first upper electrode film, the ferroelectric film and the intermediate film being crystallized and having columnar crystal structures, respectively; and forming, after the first heat treatment and above the first upper electrode film, a second upper electrode film comprising an oxide of at least one metal selected from a group consisting of Pt, Pd, Rh, Ir, Ru, and Os at a second temperature lower than the first temperature, wherein the intermediate film comprises a conductive material containing Sr, Ru, and O, a conductive material containing La, Sr, Mn, and O, or a conductive material containing La, Sr, Co, and O.