Patent ID: 6186154
Filing Date: 2001-02-13
Classification: C23C

Abstract:
A method for detecting completion of reaction chamber cleaning whereby the processing steps that are performed by said reaction chamber comprise successive deposition of reactant gasses that are deposited for formation of semiconductor devices, said reactant gasses being sequentially deposited in an uninterrupted processing sequence over a surface of at least one semiconductor substrate that is positioned inside said reaction chamber, said sequential deposition comprising a deposition of WF.sub.6 or WSi.sub.x followed by a deposition of SiClH.sub.2 followed by a deposition of SiH.sub.4, said method comprising:providing a reaction chamber adapted to receive a semiconductor substrate and reactant gasses therein;performing one or more sequences of said processing sequences that are performed inside said reaction chamber;introducing a cleaning agent comprising ClF.sub.3 into said reaction chamber, starting a process of cleaning said reaction chamber, said introducing a cleaning agent containing ClF.sub.3 into said reaction chamber to be initiated after said at least one semiconductor substrate has been removed from said CVD reaction chamber, said removal to be performed after at least one of said sequential depositions comprising a deposition of WF.sub.6 or WSi.sub.x followed by a deposition of SiClH.sub.2 followed by a deposition of SiH.sub.4 has been completed;monitoring pressure within said reaction chamber;calculating and tracking pressure versus time gradient of change for said pressure within said reaction chamber; andterminating the cleaning process of said reaction chamber.