Photo-charge generation efficiencies and photoconductivities were measured at 632.8 nm in a series of polysiloxanes bearing hole-conductors doped with C-60 as sensitizer. Generation and transport of mobile carriers were strongly dependant on the charge-transfer (CT) complex formed between the hole conducting polymer and the sensitizer. We investigated the dependence of the ionization potential of hole conducting polymer on the photoconductive properties of the CT complex. The composite containing polymer with lower ionization potential had the highest photo-charge generation efficiency and photoconductivity.