Patent ID: 6773687
Filing Date: 2004-08-10
Classification: B01D,C23C

Abstract:
A method for removing impurities out of an exhaust gas discharged from a chamber used for depositing metallic films on objects, comprising:discharging the exhaust gas containing impurities generated from a process selected from the group consisting of: (i) a process for depositing TiN on an object by using TiCl4, (ii) a process for depositing WN on an object by using WF6, (iii) a process for depositing W on an object by using WF6, (iv) a process for depositing WSi on an object by using WF6 and (v) a process for depositing Ta2O5 on an object by using pentoethoxy tantalum; injecting a reactant gas selected from the group consisting of an oxygen-containing gas, water and ammonia into the exhaust gas, wherein the reactant gas reacts with the impurities to form reaction by products which have a lower vapor pressure than the vapor pressure of the impurities, and passing the reaction by product-containing gas through a condenser, wherein the reaction by-products are condensed out of the exhaust gas.