Patent ID: 6932866

Claim:
Method for depositing in particular crystalline layers on in particular crystalline substrates in a process chamber ( 1 ) of a reactor housing with a water-cooled wall ( 2 ), the base ( 3 ) of the process chamber ( 1 ) being heated, and one or more reaction gases being introduced centrally into the process chamber ( 1 ) as process gas, together with hydrogen as carrier gas, and being discharged through a gas outlet ring ( 5 ) which surrounds the process chamber ( 1 ), a purge gas ( 7 ) flowing between reactor cover ( 6 ) and processing chamber ceiling ( 4 ), which purge gas ( 7 ), together with a purge gas ( 8 ) which purges the space ( 12 ) between reactor wall ( 2 ) and gas outlet ring ( 5 ), is passed through a gap ( 9 ) between reactor ceiling ( 4 ) and the gas outlet ring ( 5 ), which can be lowered to allow loading of the process chamber ( 1 ), into the outer region ( 1 ′) of the process chamber ( 1 ), in order to be sucked into the gas outlet ring ( 54 ) together with the process gas ( 10 ) through openings ( 11 ), the gas which purges the space ( 12 ) between reactor wall ( 2 ) and gas outlet ring ( 5 ) being nitrogen or a mixture of hydrogen and nitrogen.