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Chemical structure of P3HT and PCPM. Electrons are transferred from P3HT to PCBM under illumination.
Photocurrents for (a) electrons and (b) holes from samples with different compositions.
Electrical field dependence of (a) electron and (b) hole mobility for samples with different compositions. The inset of (b) shows how transit time is obtained in the dispersive photocurrent profile.
Photocurrent of (a) holes and (b) electrons for the thick film at different solvent evaporation rates; inset of (b): photocurrent of device with composition before and after heat annealing.
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