The photoconductive properties of poly(disilanyleneoligothienylene)s [PDS(Th)(m); m = 2-4], which have a disilanylene group and an oligothienylene unit in a polymer backbone, and fullerene (C-60) doping effects were investigated. It tvas found that these polymers are photoconductive and have photocarrier generation maxima in accordance with their optical absorption spectra. The polymer PDS-(Th)(4) was photoconducting when irradiated in the visible light and the quantum efficiency for photocarrier generation was 2% at 480 nm (E = 6 x 10(5) V cm(-1)). The hole-drift mobility was measured and ranged between 1.1 x 10(-4) cm(2) V-1 s(-1) at 2 x 10(5) V cm(-1) and 2.1 x 10(-4) cm(2) V-1 s(-1) at 6 x 10(5) V cm(-1) at room temperature. As far as we know, this is the first observation of photocarrier generation in the visible region in silicon-based polymers, Furthermore, C-60 doping enhanced the photoconductivity quantum efficiency effectivity to 85% at 470 nm (E = 3 x 10(5) V cm(-1)) by a photoinduced charge transfer mechanism.