Patent ID: 6610179
Filing Date: 2003-08-26
Classification: C23C,G02B

Abstract:
A system for controlling a deposition thickness distribution over a substrate comprising:(a) a motor that rotates the substrate; (b) at least one sensor that senses the deposition thickness of the substrate at two or more radii on the substrate; (c) an actuator that varies a shadow of a mask disposed over a target used to sputter material on the substrate; (d) an ion source that generates an ion beam directed toward the target; wherein the mask is positioned between the ion source and the target, and the mask selectively blocks ion current from the ion source from reaching the target; (e) a process controller coupled to the at least one deposition thickness sensor and the actuator, and (f) wherein, in response to a sensed deposition thickness, the process controller varies the shadow of the mask with respect to the target to control the deposition thickness distribution over the substrate.