Patent ID: 7718004
Filing Date: 2010-05-18
Classification: C23C,C23F,H01J

Abstract:
1. A gas-introducing system for plasma CVD and cleaning, comprising: a showerhead comprising a top plate with a gas inlet port through which a reaction gas or activated cleaning gas is to be introduced into an interior space of the showerhead, and a shower plate having multiple holes though which the reaction gas or activated cleaning gas is to be discharged into a reactor; a rectifying plate installed in the interior space of the showerhead, dividing the interior space into an upper space and a lower space which are of substantially equal diameter, and having multiple holes through which the upper space and the lower space are communicated; a means for inhibiting inactivation of active species of the activated cleaning gas at the rectifying plate; and a piping unit for connecting the gas inlet port of the showerhead to a pipe extending from a remote plasma unit and a reaction gas introduction port, wherein the means is a structure wherein the piping unit comprises inner and outer pipes coaxially disposed, said inner pipe connecting the pipe extending from the remote plasma unit and the rectifying plate and communicating the remote plasma unit and the lower space of the showerhead without exposing the active species of cleaning gas to the upper space of the showerhead, said outer pipe being provided with a connection port and connecting the pipe extending from the remote plasma unit and the top plate via the connection port which connects the outer pipe and the top plate and insulates the outer pipe from the top plate, said outer pipe communicating the reaction gas introduction port and the upper space of the showerhead and also communicating with the lower space of the showerhead via the rectifying plate.