Memc Electronic Materials, Inc.

Speedfam-ipec Corporation

Charles Chiun-Chieh Yang

Robert Wendell Standley

Stephen C Schultz

John Derwood Herb

Michael John Ries

Darrell D Watkins, Jr

A polishing pad assembly for use in a chemical-mechanical polishing apparatus comprises a polishing pad having at least a first aperture therethrough and a platen for supporting the polishing pad having a second aperture therethrough at least a portion of which is larger than the first aperture. A substantially transparent plug includes at least a first section having a first dimension for positioning substantially within the first aperture and at least a second section having a second dimension larger than the first dimension for positioning substantially within the second aperture. The optical plug is made of a polymeric material which may be press-fit through the platen into polishing pad.

Polishing pad window for a chemical-mechanical polishing tool

This invention is directed to a novel process for the preparation of a silicon wafer comprising a surface having an epitaxial layer deposited thereon. In one embodiment, an epitaxial layer is deposited onto a surface of a silicon wafer. The wafer is also heated to a temperature of at least about 1175&deg; C. This heat treatment begins either during or after the epitaxial deposition. Following the heat treatment, the heated wafer is cooled for a period of time at a rate of at least about 10&deg; C./sec while (a) the temperature of the wafer is greater than about 1000&deg; C., and (b) the wafer is not in contact with a susceptor. In this process, the epitaxial deposition, heating, and cooling are conducted in the same reactor chamber.

Method for the preparation of an epitaxial silicon wafer with intrinsic gettering

A modified susceptor for use in an epitaxial deposition apparatus and process is disclosed. The modified susceptor has an inner annular ledge capable of supporting a semiconductor wafer and has a plurality of holes in the surface to allow cleaning gas utilized during an epitaxial deposition process to pass through the susceptor and contact substantially the entire back surface of the semiconductor wafer and remove a native oxide layer. Also, the plurality of holes on the susceptor allows dopant atoms out-diffused from the back surface during the epitaxial deposition process to be carried away from the front surface in an inert gas stream and into the exhaust such that autodoping of the front surface is minimized.

Modified susceptor for use in chemical vapor deposition process

An apparatus and method for forming an epitaxial layer on and a denuded zone in a semiconductor wafer. A single chamber is used to form both the epitaxial layer and the denuded zone. The denuded zone is formed by heating the wafer in the chamber and then rapidly cooling the wafer while it is supported on an annular support whereby only a peripheral edge portion of the wafer is in contact with the support.

Method and apparatus for forming a silicon wafer with a denuded zone

A single crystal silicon wafer with a back surface free of an oxide seal and substantially free of a chemical vapor deposition process induced halo and an epitaxial silicon layer on the front surface, the epitaxial layer is characterized by an axially symmetric region extending radially outwardly from the central axis of the wafer toward the circumferential edge of the wafer having a substantially uniform resistivity, the radius of the axially symmetric region being at least about 80% of the length of the radius of the wafer.

Growing community of inventors

St. Peters, MO, United States of America

Charles Chiun-Chieh Yang