Bipolar charge transport in poly(3-hexyl thiophene)/methanofullerene blends: A ratio dependent study

Baumann, A.; Lorrmann, J.; Deibel, C.; Dyakonov, V.
December 2008
Applied Physics Letters;12/22/2008, Vol. 93 Issue 25, p252104
Academic Journal
We investigated the charge carrier mobility in pristine poly(3-hexyl thiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C61 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 10-3–10-2 cm2/V s for a concentration of 90% PCBM in the blend.


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