Patent ID: 8282902

Claim:
A method for producing trichlorosilane comprising: a step of providing a plurality of silicon seed rods inside a reactor; a polycrystalline silicon depositing step of heating the silicon seed rods, and supplying a first raw material gas for depositing polycrystalline silicon which contains trichlorosilane and hydrogen gas inside the reactor so as to deposit polycrystalline silicon on surfaces of the silicon seed rods and surfaces of parts inside the reactor; and a subsequent trichlorosilane producing step of switching from the first raw material gas for depositing polycrystalline silicon to a second raw material gas for producing trichlorosilane which contains silicon tetrachloride and hydrogen gas, and supplying the second raw material gas for producing trichlorosilane into the reactor in a state where the surfaces of the silicon seed rods and the surfaces of the parts inside the reactor are coated with deposited polycrystalline silicon so as to produce a reaction product gas containing trichlorosilane.