The photoconductive properties of a series of oligogermanes with dendrite or linear skeleton have been studied by flash photolysis time-resolved conductivity (FP-TRMC) technique. The values of mobility (Sigma mu) and photocarrier generation yield (0) have been discussed as a function Of C-60 concentration. The phi Sigma mu values in the order of 10(-4) to 10(-3) cm(2)/VS were observed for the oligogermanes upon exposure to 532, 355, and 193 nm light. The intrinsic value of mobility in the derivatives was also estimated without contribution from the additives, suggesting the presence of a highly conducting path along the Ge backbones of not only linear oligogermanes but also hyperbranched germanium dendrites.