Patent ID: 8821643
Filing Date: 2014-09-02
Classification: B08B,H01L

Abstract:
1. A method of removing impurities deposited in an annealing chamber, comprising: introducing phosphorus doped substrates into the annealing chamber; performing an annealing process of the phosphorus doped substrates in the annealing chamber, wherein the annealing process results in phosphorus dopant being deposited on surfaces of the annealing chamber; removing the phosphorus doped substrates from the annealing chamber; flooding the chamber with a volatilizing gas consisting of oxygen or oxygen with an inert gas to contact the surfaces of the annealing chamber, wherein the oxygen reacts with the phosphorus dopant to form a volatile product comprising the phosphorus dopant; applying heat to volatilize the volatile product comprising the phosphorus dopant deposited on the surfaces of the annealing chamber during absence of phosphorus doped substrates; exhausting the chamber to remove volatilized phosphorus dopant from the annealing chamber; and flowing an inert gas into the annealing chamber to remove the volatilizing gas from the annealing chamber.