Applied Physics Letters · 2008 · 79 citations · 10 references
Natural SciencesMaterials SciencePhysicsElectronic MaterialsPolymer ChemistrySemiconductor MaterialsCarrier TransportCharge Carrier TransportConductive PolymersElectron TransportOrganic Electronic MaterialsOrganic SemiconductorsCarrier MobilityCarrier Transport In Organic SemiconductorsCharge Carrier DensityCharge Carrier DynamicsCharge Carrier MobilityCharge TransportPhotoconductivityTransport In Polymer Blends
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 10−3–10−2cm2∕Vs for a concentration of 90% PCBM in the blend.
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