Patent ID: 9018105
Filing Date: 2015-04-28
Classification: C23C

Abstract:
1. A method for depositing semiconductor layers consisting of a plurality of components on one or more substrates ( 21 ) which are supported on a susceptor ( 2 ), the susceptor forming a wall portion of a process chamber ( 1 ), said wall portion being heated by a heating device ( 5 ) to a process temperature, process gases containing an organometallic component of the II or III main group and a hydride of the V or VI main group and provided by a gas mixing system ( 22 ) being introduced together with a carrier gas into the process chamber ( 1 ) through flow channels ( 15 , 16 , 18 ) of a gas inlet element ( 8 ), which carrier gas flows through the process chamber ( 1 ) substantially parallel to the susceptor and leaves through a gas outlet element ( 7 ), the process gases decomposing into products of decomposition in a pyrolytic manner at least on a surface of the heated substrate ( 21 ) and the decomposition products growing to form a coating at least in certain regions on the substrate surface and on a surface of the gas outlet element ( 7 ) that is located downstream at a spacing (D) from a downstream edge ( 2 ′) of the susceptor, a first process step being carried out at a first process temperature and after that, a second process step being carried out at a second process temperature without intervening cleaning or exchange of the gas outlet element ( 7 ) coated by growth of decomposition products, the second process temperature being higher than the first process temperature by at least 500° C., the method characterized in that the spacing (D) is sufficiently great to prevent the decomposition products, or fragments or agglomerations of the decomposition products, evaporating, at the second process temperature, from the coating on the gas outlet element ( further characterized in that heating of the gas outlet element (