Patent ID: 6300144
Filing Date: 2001-10-09
Classification: C23C,H01L

Abstract:
A method for the formation of a ferro-electric film with a thickness in the range from 50 nm to 350 nm on a substrate comprising:a) depositing a ferro-electric layer of a chemical PZT precursor solution on said substrate, by means of a sol-gel technique;b) evaporating at least the majority of the solvents in said layer by means of a thermal treatment at a first temperature;c) inducing pyrolysis at a second temperature higher than said first temperature; and wherein the sequence of a), b) and c) is performed at least twice to thereby form a plurality of ferro-electric layers of said ferro-electric film, each of said ferro-electric layers of said plurality having a thickness of 50 nm or smaller than 50 nm, and thereafter a crystallization is performed resulting in said ferro-electric film having a remnant polarization varying less than 30% in said thickness range.