Abstract:
A wafer chuck for use in a semiconductor process chamber capable of producing an inert gas blanket positioned on the chuck from residual chemical vapor in the chamber is disclosed. A plurality of mounting pins for supporting a wafer is further provided in the upper surface for forming an inert gas into a cavity formed between the wafer and the upper surface of the chuck. A plurality of apertures in a sidewall of the body portion for flowing an inert gas into the lower chamber forming an inert gas blanket blocking a passageway between the upper and lower chambers, thus preventing the wafer from damage by residual chemical vapor in the lower chamber.
Abstract:
An improved hoop support for semiconductor wafers reduces contamination of the wafer during edge beveling operations through the use of support pins that make only line contact with the wafer. The support pins are spaced around the periphery of the hoop and possess a triangular cross section. Two intersecting sides of the pins form an edge that defines the line contact with the wafer. These intersecting sides are preferably inclined relative to the wafer at an angle of between 60 and 80 degrees.
Abstract:
A method for eliminating wafer breakage during a wafer transfer process in a grinding apparatus by a wafer transfer pad and an apparatus for conducting such method are disclosed. In the method, a surface of the vacuum pad, or the wafer transfer pad, that is formed of sintered ceramic is first cleaned by contacting a rotating brush and a spray of cleaning solvent. The invention further discloses an apparatus for eliminating wafer breakage during the wafer transfer process by a vacuum pad by incorporating a pressure regulating valve situated in the vacuum conduit such that a vacuum pressure applied can be regulated at a rate not higher than 30 psi/sec. to the surface of the wafer transfer pad.