The efficiency of bulk heterojunction solar cells is known to suffer from unbalanced electron and hole transport within the donor and acceptor material. Using an inorganic component offers the possibility of setting up its transport properties namely mobility, conductivity and charge carrier density and adjusting it to an optimum for the combined performance with the organic material. Our measurements on field effect transistors made of the organic semiconductor poly(3-hexylthiophene) and the variedly doped inorganic Al-doped Zinc Oxide nanoparticles allow the determination of charge carrier mobility in dependence of the accumulated charge carrier densities and temperature. With respect to the morphology, we survey the properties of the transport in disordered systems, organic and inorganic, considering the underlying transport models. Furthermore we compare the effect of doping induced and accumulation induced increase in charge carrier density. Whereby the former goes along with additional defect states and the latter remains at a constant trap density. We show that by doping Zinc Oxide nanoparticles it is possible to adjust a balanced electron and hole transport in the hybrid material.

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