Patent ID: 7303927
Filing Date: 2007-12-04
Classification: H01L

Abstract:
1. A three-dimensional ferroelectric capacitor comprising: a lower electrode formed on an inter-layer dielectric film which is formed on a substrate, a ferroelectric film formed on said lower electrode, and an upper electrode formed on said ferroelectric film, wherein said ferroelectric film has a plurality of hemi-spherically shaped three-dimensional protruding parts formed on a surface thereof to expand the surface area of the ferroelectric film, said upper electrode having a plurality of hemi-spherically shaped three-dimensional protruding parts formed on a surface of said upper electrode that is distal from said ferroelectric film surface and that overlap said protruding parts of said ferroelectric film, and said ferroelectric film has isotropy with respect to the direction of crystallization and has a continuous and homogeneous crystal structure.