Typically, the organosilicon compound is exemplified by the silane or polysilane compounds represented by the general formula R2n+2 Sin, in which R is a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, phenyl and vinyl groups, not all of the R in a molecule being hydrogen atoms, and n is a positive integer not exceeding 4, or silhydrocarb