Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.020
Publication date: 30th March 2023
The ternary blend approach has been shown to improve spectral coverage and enhance the power conversion efficiency of the single junction organic bulk hetrojunction solar cells. Here, we introduce a high band gap n-type perylene dimer to PM6:Y6 binary blend as a third light absorber to enhance the short circuit current density (JSC) and hence the overall PCE of the organic solar cells (OSCs). Due to strong absorption in the visible region, perylene acts as an antenna to capture high-energy photons and readily transfer them into the primary donor and acceptor molecules via energy and charge transfer processes. A systematic study was conducted to compare charge and energy transfer dynamics and orientational dependence nanomorphology of ternary blends and were compared with their binary counterparts. Femtosecond transient absorption measurements reveal enhanced hole transfer efficiency in the finally tuned ternary mixtures. In addition, we show from the GIWAXS measurements that the incorporation of TPDI enhances lamellar stacking in the PM6 nanodomains along with enhanced crystallization in the Y6 nanodomains, hence decreasing structural disorder. Our study provides insight into employing non-fullerene acceptors (NFA) having complementary absorption to alternatively harvest the photons via resonant energy transfer process to realize improved photovoltaic performance in OSCs.
This work was supported by the UKRI Global Challenge Research Fund project SUNRISE (EP/P032591/1) and the EPSRC-funded project ATIP (EP/T028513/1). S.P. thank the Science and Engineering Research Board (SERB) for funding under the scheme of IRHPA grant no. IPA/2020/000033. The authors would also like to thank Synchrotron SOLEIL for providing beamtime at the SIRIUS beamline. Thanks to the Lessard research group (University of Ottawa, Canada) and Dr. Arnaud Hemmerle for help in data acquisition.
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