Patent ID: 6197119
Filing Date: 2001-03-06
Classification: B01D,C23C,H01J,Y02C,Y10S

Abstract:
A method of controlling build-up of polymerized TEOS in a vacuum pump line carrying effluent laden with TEOS, water, and ethylene byproducts of TEOS CVD of SiO.sub.2 films, comprising:adsorbing and retaining TEOS and water molecules from the effluent on adsorption surfaces in a trap for long enough dwell time to consume substantially all of the water molecules in TEOS hydrolysis reactions while allowing non-hydrolyzed TEOS molecules and ethylene molecules to continue flowing in the effluent and retaining solid and/or liquid phase TEOS polymers formed by the hydrolysis reactions on the absorption surfaces in the trap.