Patent ID: 8652296

Claim:
A side gas injector for a plasma reaction chamber, comprising: a circular distribution plate comprising an injection hole for injecting a reaction gas and a distribution channel part for distributing the reaction gas such that the reaction gas introduced from the injection hole can be radially simultaneously jetted in a plurality of positions along an inner circumference surface of the distribution plate; and a cover plate coupled to a top of the distribution plate and sealing a top of the distribution channel part; wherein the distribution channel part comprises: inlet ports which the reaction gas enters; a plurality of jet ports arranged at equal intervals along the inner circumference surface of the distribution plate; and a branch channel having flow paths sequentially branched such that the reaction gas introduced into the inlet port is uniformly distributed to each of the plurality of jet ports, wherein a plurality of the inlet ports are spaced apart and arranged along an outer circumference of the branch channel, wherein a circular diffusion channel communicating with the injection hole is provided in an outer circumference of the branch channel such that the reaction gas is uniformly distributed to the plurality of inlet ports, wherein, in the diffusion channel, a diffusion prevention jaw is provided such that a circular first diffusion path communicating with the injection hole and a second diffusion path are isolated and formed, and wherein an inlet hole and an outlet hole communicating with each other are provided in bottom surfaces of the first and second diffusion paths, respectively.