Patent ID: 6514835
Filing Date: 2003-02-04
Classification: C23C,H01L

Abstract:
A method of forming a product ferroelectric film on a substrate having front and back surfaces, comprising the steps of:coating the substrate on the back surface thereof with a backside coating of a material that is in tension with respect to the substrate at deposition temperature of the ferroelectric film; depositing the ferroelectric film on the front surface of the substrate at said deposition temperature; cooling the substrate having the ferroelectric film and backside coating thereon to cause the ferroelectric film to attain tensile stress; removing the backside coating from the substrate, to cause the ferroelectric film to change from a tensile stress state to a compressive stress state; and thermally processing the substrate having the ferroelectric film thereon, to cause the polarization direction of the ferroelectric film to be perpendicular to the substrate surface, thereby forming the product ferroelectric film.