Patent ID: 6740367
Filing Date: 2004-05-25
Classification: C23C,H01J

Abstract:
A method for forming a thin film on a substrate by using a plasma CVD film-forming device, comprising:loading and supporting a single flat substrate on a concave susceptor, wherein the substrate contacts said susceptor only at a lower rim of the substrate while forming the film; controlling the atmosphere in a vacuum chamber, wherein a reaction gas is substantially uniformly supplied through a showerhead toward the substrate on the susceptor; applying energy between the showerhead and the susceptor to generate a plasma adjusting a distribution of electric field intensity over the flat substrate to minimize non-uniform thickness of a film formed on the substrate by adjusting a distance between the showerhead surface and the susceptor surface, said distance satisfying the following relation: fdâ€²=|dcâ€²âˆ’daâ€²|/daâ€²Ã—100 fdâ€²=1%Ëœ35% wherein:fdâ€² is a deformation ratio of the central part of said susceptor's surface that faces said substrate, daâ€² is the average distance between said showerhead and said susceptor at an outer perimeter position of said substrate, wherein daâ€² is in the range of 3 to 300 mm, dcâ€² is the average distance between said showerhead and said susceptor at a point on a radius of a distance equivalent to daâ€² from the center of said substrate, wherein the concave surface of the susceptor is substantially spherically curved, wherein dcâ€² is in the range of 3.3 to 350 mm, and said susceptor has a concave surface continuously slanting toward the center of the susceptor; and forming a thin film on the flat substrate, wherein the film has a uniform thickness.