| 摘要 |
A gas delivery apparatus comprises: a chamber surrounding a substrate to be processed; a showerhead disposed within the chamber; and gas supply means supplying a gas comprising a mixture of NH3 and H2 to the chamber, in which a coating layer deposited on the interior of the chamber and the showerhead contain nickel (Ni). When the apparatus is utilized to practice a method comprising exposing an object W to a gas comprising a mixture consisting of NH3 and H2, the H2/NH3 gas flow rate ratio and the temperature are controlled so that the reaction of nickel contained in the coating layer deposited on the interior of the chamber and the showerhead is suppressed.
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