Patent ID: 8993422
Filing Date: 2015-03-31
Classification: C23C,H01J,H01L

Abstract:
1. A method of forming a device, the method comprising: placing a first substrate over a chuck of a chamber; positioning a shield between a plasma source and the chuck, the shield covering a first peripheral region of the chuck, wherein the shield includes a central opening exposing a central region of the chuck; adjusting a diameter of the central opening to a first opening size; and after adjusting the diameter of the central opening to the first opening size, exposing the first substrate to a first plasma from the plasma source, wherein the shield blocks a direct path of the first plasma to the first peripheral region without blocking a direct path of the first plasma to the first substrate during the exposing; removing the first substrate from over the chamber; and after removing the first substrate, adjusting the diameter of the central opening of the shield to a second opening size, wherein the shield is configured to operate with wafers of different diameters by changing the diameter of the central opening, wherein the central opening of the shield is adjusted from the first opening size to the second opening size before exposing another substrate.