Patent ID: 9670580
Date: 2017-06-06
CPC Classifications: B08B,C23C

Claim:
1. A method for depositing layers on one or a plurality of substrates ( 7 ) arranged in a process chamber ( 6 ) of a chemical vapor deposition (CVD) reactor, wherein at least one carbon-containing gaseous source material is used in at least one deposition step, wherein parasitic coatings are also deposited on the wall surfaces ( 5 , 8 ) of the process chamber ( 6 ) during the layer growth on the one or plurality of substrates, wherein, after removal of the one or plurality of substrates ( 7 ) from the process chamber, the parasitic coatings react in a cleaning process, as a result of an introduction of a gas flow containing one or a plurality of cleaning gases and heating of the process chamber ( 6 ) to a cleaning temperature, into volatile substances, which are transported out of the process chamber ( 6 ) with the gas flow, characterized in that the cleaning process comprises (i) a first breakdown step as an initial step of the cleaning process, (ii) a second breakdown step that follows the first breakdown step, the parasitic coatings being broken down during the first and second breakdown steps into volatile constituents and a carbon-containing residue which remains on the wall surfaces ( 5 , 8 ), and (iii) an ammonia cleaning step following the second breakdown step, wherein in the first breakdown step, H 2 is introduced into the process chamber ( 6 ) at a first temperature, wherein in the second breakdown step, Cl 2 and N 2 are introduced into the process chamber ( 6 ) at a second temperature that is lower than the first temperature, wherein in the ammonia cleaning step, the carbon-containing residue reacts with ammonia, which is introduced into the process chamber ( 6 ), to form a volatile compound, which is transported out of the process chamber ( 6 ) with the gas flow, and wherein in the ammonia cleaning step, only NH 3 and H 2 only NH 3 and N 2 , or only NH 3 and a noble gas are introduced into the process chamber at a third temperature that is higher than the second temperature.