We investigated the charge carrier mobility in pristine poly(3-hexyl thiophene-2,5-diyl) (P3HT):[6,6]-phenyl- butyric acid methyl ester (PCBM) blend devices by applying the time resolved photoconductivity experiment in dependence on the donor:acceptor ratio. We observe a bipolar transport in all studied samples ranging from pure polymer to polymer:fullerene with 90% PCBM content. For the ratios P3HT:PCBM 1:4 and 1:1 we observe two transit times in the electron current transients as well as hole double transients for P3HT:PCBM 1:2. We find high hole and electron mobilities in the order of for a concentration of 90% PCBM in the blend.
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© 2008 American Institute of Physics.
2008
American Institute of Physics
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