Patent ID: 7550302
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the steps of: forming a first interlayer insulating film over a semiconductor substrate; forming a first conductive film on the first interlayer insulating film; forming a first ferroelectric film, which is crystallized, on the first conductive film; annealing the first ferroelectric film; after the annealing, forming a second ferroelectric film made of any one of an amorphous material and a microcrystalline material on the first ferroelectric film; forming a second conductive film on the second ferroelectric film; and forming a capacitor including a lower electrode, a capacitor dielectric film, and an upper electrode by patterning the first conductive film, the first ferroelectric film, the second ferroelectric film, and the second conductive film; wherein the step of forming the second conductive film further includes the steps of: forming a first metal oxide film; forming, on the first metal oxide film, a second metal oxide film containing a larger amount of oxygen than that in the first metal oxide film; and forming a conductivity-improving film on the second metal oxide film.