Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Hybrid solar cells, where light absorption happens in a semiconducting polymer and charge separation at a metal-oxide/polymer interface, show up to now limited efficiencies. One limitation is caused by relative low charge carrier mobility in the metal-oxide. Core-shell nanostructured hybrid solar cells based on a doped TiO2 core with a pure TiO2 shell allow increasing electron mobility without additional recombination effects. As organic hole transport material we use poly(3-hexyl thiophene). We show two examples where this strategy has been successfully employed: 1) The core consists of hydrothermally grown Sn:TiO2 wires conformally coated with a thin TiO2 shell and 2) the core consists of S-doped TiO2 particle films forming a mesoporous layer surrounded by a TiO2 shell. The doping increases the charge carrier mobility in the core of the nanostructures while decreasing the charge carrier recombination at the metal-oxide/polymer interface due to fast electron extraction from this interface driven by a cascaded conduction band energy from shell to core of the nanowires. These doped cores with an undoped shell structure resulted in impressive efficiency improvement in hybrid solar cells compared to the reference TiO2–based device.
Dorman, J.A.; Weickert, J.; Reindl, J.B.; Putnik, M.; Wisnet, A.; Noebels, M.; Scheu, C.; Schmidt-Mende, L. Control of Recombination Pathways in TiO2 Nanowire Hybrid Solar Cells using Sn4+ Dopants, submitted
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