Patent ID: 6306666
Filing Date: 2001-10-23
Classification: H01L

Abstract:
A method for fabricating a ferroelectric memory device comprising the steps of:forming an intermetal insulating layer provided with a contact hole exposing a junction region formed on a semiconductor layer having the junction region;forming a contact plug within the contact hole;forming successively a barrier layer and a metal layer for storage node electrode on the intermetal insulating layer:forming a storage node electrode by patterning the metal layer for storage node electrode and the barrier layer to be contact with the contact plug;depositing a ferroelectric layer on a semiconductor substrate in which a lower electrode is formed, the ferroelectric layer is deposited at a temperature that the storage node electrode is not oxidized;crystallizing the ferroelectric layer;heat-treating the crystallized ferroelectric layer, the crystallized ferroelectric layer is performed by oxynitride or oxygen plasma treatment for 1.about.30 minutes so as to remove impurities diffused from the ferroelectric layer during depositing the ferroelectric layer and so as to prevent oxygen discrepancy caused by the nitrogen; andforming a plate electrode on the ferroelectric layer.