Patent ID: 6162293
Filing Date: 2000-12-19
Classification: C23C,H01L

Abstract:
A method for manufacturing a ferroelectric thin film having a layered perovskite crystal structure and having a multi-layered structure of two or more layers, of the general formula: Bi.sub.2 A.sub.m-1 B.sub.m O.sub.3m+3, wherein A is selected from the group consisting of Na.sup.1+, K.sup.1+, Pb.sup.2+, Ca.sup.2+, Sr.sup.2+, Ba.sup.2+ and Bi.sup.3+, B is selected from the group consisting of Fe.sup.3+, Ti.sup.4+, Nb.sup.5+, Ta.sup.5+, W.sup.6+ and Mo.sup.6+, and m represents an integer of 1 or larger, which comprises introducing into a film formation chamber where a substrate having an oxide layer as a buffer layer thereon is set, gaseous starting materials inclusive of oxygen gas for forming the ferroelectric thin film in which the flow rate of oxygen gas as one component of the gaseous starting materials is controlled to an arbitrary value necessary for the formation of the ferroelectric thin film having a desired orientation while the pressure inside the film formation chamber and the total flow rate of the gaseous starting materials and an optionally introduced carrier gas are maintained constant.