Patent ID: 6537928
Filing Date: 2003-03-25
Classification: C23C,H01J,H01L

Abstract:
A method for forming a thin film on a semiconductor substrate by plasma reaction, comprising the steps of:introducing a reaction gas into an upper section of a reaction chamber; exciting a plasma in the upper section to react the reaction gas by applying electrical power between an upper electrode and a lower stage on which a substrate is place; enclosing the plasma in the upper section by providing below the upper electrode an intermediate electrode having the same electrical potential as the lower stage, said intermediate electrode having plural pores through which the activated reaction gas passes; cooling a section under the upper section by controlling a cooling plate disposed between the intermediate electrode and the lower stage at a temperature lower than the intermediate electrode, said cooling plate having plural pores through which the cooled reaction gas passes, wherein a middle section is formed between the intermediate electrode and the cooling plate; and controlling the lower stage at a temperature lower than the cooling plate, wherein a lower section is formed between the cooling plate and the lower stage, whereby reaction products accumulate on the substrate.