Patent ID: 6048737
Filing Date: 2000-04-11
Classification: H01L

Abstract:
A method for the fabrication of a ferroelectric capacitor, comprising the sequential steps of:forming a SiO.sub.2 layer over a silicon substrate;depositing a first metal adhesive layer over the SiO.sub.2 layer to enhance adhesion of a metal electrode layer to the SiO.sub.2 layer;depositing a second metal electrode layer upon the first metal adhesive layer, to form a bottom metal electrode layer;depositing a conductive oxide upon the bottom metal electrode layer, to form a lower subelectrode layer, without first annealing the bottom metal electrode layer;annealing said lower subelectrode layer and bottom metal electrode layer together;depositing a ferroelectric material upon the lower subelectrode layer, to form a ferroelectric layer after the step of annealing the lower subelectrode layer;annealing the ferroelectric material deposited on the lower subelectrode layer;depositing a second conductive oxide upon the ferroelectric layer, to form an upper subelectrode layer; anddepositing a third metal layer upon the upper subelectrode layer, to form a top metal electrode layer.