Patent ID: 6113705
Filing Date: 2000-09-05
Classification: C23C

Abstract:
A high-speed rotational vapor deposition apparatus for forming a thin film, which includes plural reaction gas supply ports at the top portion of a hollow reactor, an exhaust port at the bottom portion of the reactor, a rotational substrate holder which is provided inside the reactor and on which a wafer substrate is mounted, and a straightening vane having plural gas holes formed at the upper portion of the inside thereof, thereby forming a thin film on the surface of a wafer substrate on the rotational substrate holder by supplying the reaction gas into the reactor, characterized in that the hollow inside of said reactor is partitioned into cylindrical upper and lower portions which have the same center axis and are different in equivalent inner diameter, the equivalent inner diameter of said upper portion being smaller than that of said lower portion, and the lower end of said upper portion and the upper end of said lower portion being linked to each other by a link portion to make continuous the hollow insides of said upper and lower portions of said reactor, and that the lower end of said link portion is disposed so as to be spaced from the surface of the wafer substrate mounted on said rotational substrate holder by a predetermined height difference, and wherein the following condition A is satisfied:when W represents half of the difference between the inner diameter (D.sub.1) of said upper portion and the inner diameter (D.sub.2) of said lower portion on a section which is taken by a plane passing the center axis of the cylindrical portions of said upper and lower portions of the reactor, on any section,(1) the lower end of said upper portion is located at the upper side of the upper end of said lower portion by a height difference from 1/2W to W, and(2) said link portion substantially exists in an area surrounded by a first line segment connecting the lower end of said upper portion and the upper end of said lower portion, a second line segment extending from the upper end of said lower portion to the inside of said reactor perpendicularly to the center axis by 1/2W, a quarter circular arc which is connected to the second segment at one end thereof, directs to the lower end of said upper portion and has a radius of curvature of 1/2W, and a third line segment extending from the other end of the circular arc to the lower end of said upper portion, and said link portion is designed substantially in a convex shape which projects to the inside of said reactor.