Patent ID: 8841221

Claim:
A device for depositing layers, the device comprising a process chamber ( 1 ) arranged substantially rotationally symmetrically about a center ( 11 ), the process chamber having a bottom formed by a susceptor ( 2 ) disposed in a horizontal plane, a process chamber ceiling ( 3 ) disposed vertically above the susceptor ( 2 ), a gas inlet element ( 4 ) which extends in the center ( 11 ) between the susceptor ( 2 ) and the process chamber ceiling ( 3 ) and has gas inlet chambers ( 8 , 9 , 10 ) which are disposed vertically one above the other, and a heater ( 27 ) disposed vertically below the susceptor ( 2 ), for heating the susceptor ( 2 ), wherein, on the susceptor ( 2 ), a multiplicity of substrate holders ( 5 ) arranged spaced apart from the gas inlet element ( 4 ) are provided for accommodating substrates ( 6 ) to be coated, wherein a topmost gas inlet chamber ( 8 ) of the gas inlet chambers is directly adjacent to the process chamber ceiling ( 3 ) and is connected to a feed line ( 14 ) for introducing a hydride together with a carrier gas into the process chamber ( 1 ), wherein a lowermost gas inlet chamber ( 10 ) of the gas inlet chambers is directly adjacent to the susceptor ( 2 ) and is connected to a feed line ( 16 ) for introducing a hydride together with a carrier gas into the process chamber, wherein at least one middle gas inlet chamber ( 9 ) disposed between the lowermost ( 10 ) and the topmost ( 8 ) gas inlet chambers is connected to a feed line ( 15 ) for introducing an organometallic compound into the process chamber ( 1 ), characterized in that the gas inlet chambers ( 8 , 9 , 10 ) are closed off toward the process chamber ( 1 ) by annular walls ( 22 , 23 , 24 ), the annular walls ( 22 , 23 , 24 ) having a multiplicity of closely adjacent gas outlet openings ( 25 ), a uniform outer diameter, and an outer wall which is substantially without projections and faces toward the process chamber ( 1 ).