Reactor and method for producing silicon

A silicon-containing decomposed gas (2) reactor (1), (12) in a reactor (6) at least gas feeding pipeline (4) is arranged at least catalytic activity is (23), to avoid as deposited on the reaction container (3) are (4) is. The net (23) accelerated the gas (2) thermolysis, and reducing as deposited on the inner wall (4) is. Further the invention uses be according to the invention claims a method for reactor (1) for preparing silicon, and made of silicon for under the optoelectronic technology.