Patent ID: 8293076
Filing Date: 2012-10-23
Classification: C01B

Abstract:
1. A method, comprising: reacting a tetrachlorosilane comprising substance with hydrogen at a temperature of from 400° C. to 1,200° C. to obtain a mixture comprising silane, monochlorosilane, dichlorosilane, and trichlorosilane; removing impurities which are electrically active in a semiconductor crystal from the mixture; separating the trichlorosilane from the silane, monochlorosilane and dichlorosilane to obtain purified trichlorosilane; circulating the silane, monochlorosilane and dichlorosilane obtained from said separating into said reacting; and supplying a second mixture comprising dichlorosilane and a poly-silane represented by H wherein n is an integer of 2 to 4 and m is an integer of 0 to 2(n+1).