Patent ID: 6849241
Filing Date: 2005-02-01
Classification: C23C,Y10T

Abstract:
1. A device for coating a substrate comprising: a gas supply system, which provides at least two different gases or gas mixtures separately, a reaction chamber, in which at least one substrate which is to be coated is disposed on at least one heated or cooled susceptor, at least one temperature-controlled gas inlet unit, which admits at least two of the gases or gas mixtures separately into the reaction chamber via a plurality of gas paths, and which has a multiplicity of gas outlet openings, the gas inlet unit having a plate, in or at which the gas outlet openings are provided, the plate being located on the side of the gas inlet unit directed towards the susceptor, and heat being directly or indirectly supplied to or dissipated from the plate by the substrate or susceptor heating or cooling and/or by the heated or cooled substrate(s), and having a gas purged gap between the gas inlet unit and a heat sink or heat source for dissipating or supplying heat, the heat resistance of the gap being adjustable by changing the gas composition, characterized by a separation or throttle between the gap and the reaction chamber, so that the heat resistance of the gas purged gap is also adjustable via the gas pressure, and at least one buffer volume disposed between the plate and the gap, the buffer volume being associated with the gas inlet unit and formed in particular by the gas paths, the heat resistance of the buffer volume being adjustable in particular by changing the pressure and/or the gas composition of the gas in the buffer volume, the gas outlet openings being combined in groups, the number of the groups corresponding to the number of the gases or gas mixtures to be admitted separately, one of the gases or gas mixtures exiting from each group of gas outlet openings into the reaction chamber.