Patent ID: 9447500
Filing Date: 2016-09-20
CPC Classification: C23C

Claim Text:
1. A chemical vapor deposition (CVD) reactor, comprising a process chamber ( 23 ) and a substrate holder carrier ( 1 ) located therein, the carrier having at least one bearing surface ( 4 ′), a plurality of gas supply lines ( 7 , 8 ) opening into the bearing surface ( 4 ′), the carrier supporting a substrate holder ( 2 ), a rear side of which faces toward the bearing surface ( 4 ′), the bearing surface and the rear side of the substrate holder ( 2 ) forming first and second surfaces, respectively, gases fed into a space between the first and second surface through the gas supply lines ( 7 , 8 ) forming a gas cushion ( 19 ) which elevates the substrate holder ( 2 ) above the bearing surface ( 4 ′) and drives the substrate holder ( 2 ) into rotation, the CVD reactor characterized in that the gas cushion has a plurality of zones (A, C) that can be individually fed, in each case through an associated one of the gas supply lines ( 7 , 8 ), the zones being separated from one another by a diffusion barrier formed by a ring ( 15 ) that projects above the first surface and engages in an annular groove ( 17 ) located on the second surface opposite to the first surface, the annular groove ( 17 ) having a wall spacing that is greater than a width of the ring ( 15 ), such that there remains between the ring ( 15 ) and the annular groove ( 17 ) a gap ( 18 ), the gap ( 18 ) having a narrow gap width which reduces an exchange of gas between the zones (A, C).