Patent ID: 6830007
Filing Date: 2004-12-14
Classification: C23C,H01J,H01L

Abstract:
A CVD apparatus for forming a thin film on a semiconductor substrate by plasma reaction, comprising:a reaction chamber; a reaction gas inlet for introducing a reaction gas into the reaction chamber; a lower stage on which a semiconductor substrate is placed in the reaction chamber, said lower stage functioning as a lower electrode; an upper electrode for plasma excitation in the reaction chamber; an intermediate electrode with plural pores through which the reaction gas passes, said intermediate electrode being disposed below the upper electrode, wherein a reaction space is formed between the upper electrode and the intermediate electrode; and a cooling plate with plural pores through which the reaction gas passes, said cooling plate being disposed between the intermediate electrode and the lower stage, said cooling plate being controlled at a temperature lower than the intermediate electrode, wherein a transition space is formed between the intermediate electrode and the cooling plate, and a plasma-free space is formed between the cooling plate and the lower stage.