Patent ID: 6402905
Filing Date: 2002-06-11
Classification: C23C

Abstract:
A system for controlling a deposition thickness distribution on a substrate comprising:(a) a motor that rotates the substrate; (b) at least one deposition thickness sensor that senses the deposition thickness on the rotating substrate at two or more radii on the substrate; (c) at least one actuator that varies a shadow of a mask disposed over the rotating substrate, wherein the shadow has a surface area that is less than an unmasked surface area of the rotating substrate; (d) a vapor source used to deposit material on the rotating substrate; (e) a process controller coupled to the at least one deposition thickness sensor and the at least one actuator; and (f) wherein, in response to an output of the at least one deposition thickness sensor, the process controller varies the shadow of the mask along a radius of the rotating substrate to control the deposition thickness distribution.