Patent ID: 6214772
Filing Date: 2001-04-10
Classification: C23C,H01L,Y02T,Y10S

Abstract:
A method for making a polycrystalline thin film on a metal substrate base, said polycrystalline thin film consisting essentially of a plurality of grains of a cubic crystal structure defined by a-, b- and c-axes, said polycrystalline thin film being formed such that the intergranular misorientation, defined by a range of orientation of said a-axes or said b-axes, is not more than 35 degrees, and said c-axes are perpendicular to a surface of said metal substrate base, comprising the steps of:(a) placing said metal substrate base on a deposition vessel;(b) depositing the constituting elements of a target material on said metal substrate base so as to form said polycrystalline thin film;wherein during the step (b), the surface of said polycrystalline thin film being formed on said metal substrate base is irradiated with an ion beam at an oblique incidence angle to said polycrystalline thin film,wherein said oblique incidence angle is selected not less than 50 degrees and not more than 60 degrees,said metal substrate base is cooled and maintained at a temperature within the range of from -150.degree. C. to less than +100.degree. C., said temperature being lower than the temperature of the metal substrate base due to the depositing and the irradiation by the ion beam, andsaid polycrystalline thin film is selected from the group consisting of yttrium stabilized zirconia, CeO.sub.2, MgO, and SrTiO.sub.3.