Mobilities of charge carriers in dendrite and linear oligogermanes by flash photolysis time-resolved microwave conductivity technique

Abstract

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 (Σμ) and photocarrier generation yield (Φ) have been discussed as a function of C60 concentration. The ΦΣμ values in the order of 10-4 to 10-3 cm2/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. Copyright © 2005 The Chemical Society of Japan.