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Tailored Interface Energetics for Efficient Charge Separation in Metal Oxide-Polymer Solar Cells

Tailored Interface Energetics for Efficient Charge Separation in Metal Oxide-Polymer Solar Cells

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EHRENREICH, Philipp, Arthur GROH, Heather GOODWIN, Jeldrik HUSTER, Felix DESCHLER, Stefan MECKING, Lukas SCHMIDT-MENDE, 2019. Tailored Interface Energetics for Efficient Charge Separation in Metal Oxide-Polymer Solar Cells. In: Scientific reports. 9(1), 74. eISSN 2045-2322. Available under: doi: 10.1038/s41598-018-36271-w

@article{Ehrenreich2019-01-11Tailo-44655, title={Tailored Interface Energetics for Efficient Charge Separation in Metal Oxide-Polymer Solar Cells}, year={2019}, doi={10.1038/s41598-018-36271-w}, number={1}, volume={9}, journal={Scientific reports}, author={Ehrenreich, Philipp and Groh, Arthur and Goodwin, Heather and Huster, Jeldrik and Deschler, Felix and Mecking, Stefan and Schmidt-Mende, Lukas}, note={Article Number: 74} }

Ehrenreich, Philipp Goodwin, Heather Goodwin, Heather 2019-01-22T09:34:53Z Deschler, Felix Ehrenreich, Philipp Deschler, Felix eng Mecking, Stefan Tailored Interface Energetics for Efficient Charge Separation in Metal Oxide-Polymer Solar Cells Schmidt-Mende, Lukas Hybrid organic-inorganic heterointerfaces in solar cells suffer from inefficient charge separation yet the origin of performance limitations are widely unknown. In this work, we focus on the role of metal oxide-polymer interface energetics in a charge generation process. For this purpose, we present novel benzothiadiazole based thiophene oligomers that tailor the surface energetics of the inorganic acceptor TiO<sub>2</sub> systematically. In a simple bilayer structure with the donor polymer poly(3-hexylthiophene) (P3HT), we are able to improve the charge generation process considerably. By means of an electronic characterization of solar cell devices in combination with ultrafast broadband transient absorption spectroscopy, we demonstrate that this remarkable improvement in performance originates from reduced recombination of localized charge transfer states. In this context, fundamental design rules for interlayers are revealed, which assist the charge separation at organic-inorganic interfaces. Beside acting as a physical spacer in between electrons and holes, interlayers should offer (1) a large energy offset to drive exciton dissociation, (2) a push-pull building block to reduce the Coulomb binding energy of charge transfer states and (3) an energy cascade to limit carrier back diffusion towards the interface. Huster, Jeldrik 2019-01-11 Huster, Jeldrik terms-of-use Groh, Arthur Schmidt-Mende, Lukas Groh, Arthur 2019-01-22T09:34:53Z Mecking, Stefan

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