Patent ID: 6309465
Filing Date: 2001-10-30
Classification: C23C

Abstract:
CVD reactor comprising:a reactor casing with a casing cover,a heated susceptor for one wafer or several wafers, which is disposed in the reactor casing,a fluid inlet unit including a plurality of openings facing said wafer or wafers through which heated CVD media enter the reactor, anda fluid outlet disposed on the periphery of the reactor casing, through which the introduced media are discharged again,the reactor characterized in that:said fluid inlet unit comprises a hollow body spaced from said casing cover having an underside, in which said openings are provided, which is heated by said susceptor substantially by thermal radiation and/or thermal conduction,a flushing gas inlet means is provided which introduces a flushing gas into a space between an upper side of said hollow body and said casing cover in such a way that the upper side will dissipate heat into an environment outside the CVD reactor through the flushing gas, andthat conditions of heat supply and dissipation to or from said hollow body, respectively, are so controlled as to heat said CVD media, without any supply of a medium for heating from outside of a gas supply system of the CVD reactor, and that a positive temperature gradient exists between the upper side and the underside of said hollow body.