Patent ID: 8430959

Claim:
A method for preparing a polycrystalline silicon rod using a mixed core means, comprising: (a) installing a first core means made of a resistive material together with a second core means made of a silicon material in an inner space of a deposition reactor; (b) electrically heating the first core means for the purpose of heating the first core means without being cooled; (c) pre-heating the second core means by radiation heat transfer by the first core means which is electrically heated; (d) electrically heating the second core means after the second core means is pre-heated; and (e) supplying a reaction gas into the inner space in a state where the first core means and the second core means are electrically heated for silicon deposition by thermal decomposition so that silicon deposition occurs outwardly on the first core means and on the second core means with a first deposition output and a second deposition output being formed on the first core means and on the second core means, respectively, at a reaction pressure in the range of 1-20 bar absolute and a reaction temperature in the range of 650-1300° C. based on the surface temperature of the first deposition output and/or the second deposition output.