Langevin recombination and space-charge-perturbed current transients in regiorandom poly(3-hexylthiophene)

We have studied photogenerated charge carrier transport and recombination in thick films of regiorandompolys3-hexylthiophened by using the current mode time-of-flight technique. We measured the extracted chargeas a function of light intensity and applied voltage, and found that for ad@1 it saturates at a value that can bestored on the contacts Q