Patent ID: 7332038

Claim:
A device for depositing in particular crystalline layers on one or more, in particular likewise crystalline substrates in a process chamber by means of reaction gases which are introduced into the process chamber where they react pyrolytically, having a carrier plate which forms a wall of the process chamber which is heated from the rear, in particular using high frequency and consists of inert-coated graphite, having a gas-admission element, which is disposed in the center of the process chamber the chamber being circular in cross section, and is associated with a cover plate which consists of graphite and is disposed at a spacing from the carrier plate, and a gas-discharge ring which forms the outer boundary of the process chamber and has a multiplicity of radial gas outlet openings, characterized in that the gas-discharge ring is formed as a single-part consisting of solid graphite and is located in a radiation field of a high-frequency coil; characterized in that the cover plate is heated from the rear; characterized in that all the walls of the process chamber comprise solid graphite; and characterized in that the gas-discharge ring forms steps over which the cover plate engages and under which the carrier plate engages.