Patent ID: 6420274
Filing Date: 2002-07-16
Classification: C23C

Abstract:
A method for conditioning a process chamber that employs adsorbing gases at low pressures comprising the steps of:introducing a first gas into said chamber, soaking said chamber in said first gas at a pressure in the range from 10 mTorr. to 5 Torr., continuing said step of soaking for a time period whereby desorption from the walls of said chamber of residual chemicals (species) and the adsorption of first components of said first gas reaches a saturation concentration on said walls, said step of continuing continues whereby there is substantially an adsorption-desorption equilibrium on the walls of said chamber corresponding to an equilibrium during a first process, and introducing a work piece into said chamber and performing said first process in said chamber employing a gas having said first components of said first gas therein.