Patent ID: 7622346
Filing Date: 2009-11-24
Classification: H01L

Abstract:
1. A method for fabricating a ferroelectric capacitor in which a ferroelectric material is used for forming a dielectric layer, the method comprising: forming a lower electrode layer; forming a layer of the ferroelectric material on the lower electrode layer; controlling, after forming the layer of the ferroelectric material, a flow rate of an oxidation gas by one flow rate controller, controlling a flow rate of a non-oxidation gas by a plurality of flow rate controllers, and performing heat treatment in an atmosphere of a mixed gas which contains the oxidation gas and the non-oxidation gas; and forming at least part of an upper electrode layer on the layer of the ferroelectric material after the heat treatment, wherein a flow rate of the non-oxidation gas used for purging is controlled by one flow rate controller of the plurality of flow rate controllers for controlling the flow rate of the non-oxidation gas and a flow rate of the non-oxidation gas used for adjusting concentration of the oxidation gas is controlled by a second flow rate controller of the plurality of flow rate controllers.