Strong light-matter coupling for reduced photon energy losses in organic photovoltaics
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Strong light-matter coupling can re-arrange the exciton energies in organic semiconductors. Here, we exploit strong coupling by embedding a fullerene-free organic solar cell (OSC) photo-active layer into an optical microcavity, leading to the formation of polariton peaks and a red-shift of the optical gap. At the same time, the open-circuit voltage of the device remains unaffected. This leads to reduced photon energy losses for the low-energy polaritons and a steepening of the absorption edge. While strong coupling reduces the optical gap, the energy of the charge-transfer state is not affected for large driving force donor-acceptor systems. Interestingly, this implies that strong coupling can be exploited in OSCs to reduce the driving force for electron transfer, without chemical or microstructural modifications of the photo-active layer. Our work demonstrates that the processes determining voltage losses in OSCs can now be tuned, and reduced to unprecedented values, simply by manipulating the device architecture.
C. Nikolis , V , Mischok , A , Siegmund , B , Kublitski , J , Jia , X , Benduhn , J , Hörmann , U , Neher , D , Gather , M C , Spoltore , D & Vandewal , K 2019 , ' Strong light-matter coupling for reduced photon energy losses in organic photovoltaics ' Nature Communications , vol. 10 , 3706 . https://doi.org/10.1038/s41467-019-11717-5
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DescriptionFunding: Volkswagen Foundation (no.93404) (MCG), individual fellowship of the DeutscheForschungsgemeinschaft (404587082) (AM).
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