Patent ID: 6333201
Filing Date: 2001-12-25
Classification: H01L

Abstract:
A method for fabricating a nonvolatile ferroelectric memory, comprising:forming an insulating film on a semiconductor substrate;forming a bottom electrode on the insulating film;forming a ferroelectric film on the bottom electrode, wherein the ferroelectric film is formed of a material containing zirconium oxide as a base composition, the material having an antiferroelectric phase which can not be induced to a ferroelectric phase by an electric field, and the induced ferroelectric phase exhibiting a hysteresis in polarization-electric field characteristic and unable to be induced to an antiferroelectric phase by an electric field, wherein the ferroelectric film is formed by controlling a composition of PNZST or PZST, wherein the ferroelectric film is formed of the PNZST or PZST, with the ratio of Z and S being 6:4 and a content of T not less than 0.065; and,forming a top electrode on the ferroelectric film.