Bipolar Charge Transport in P3HT:PCBM Blends: A Ratio Dependent Study

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  • 30 October 2008
Abstract
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 solar cells 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 a high hole and electron mobility in the order of 10-3 - 10-2 cm2/Vs for an concentration of 90% PCBM in the blend.

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