Abstract
Power conversion efficiency (PCE) of single-junction polymer solar cells (PSCs) has made a remarkable breakthrough recently. Plenty of work was reported to achieve PCEs higher than 16% derived from the PM6:Y6 binary system. To further increase the PCEs of binary OSCs incorporating small molecular acceptor (SMA) Y6, we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital (HOMO) of PM7. Consequently, the PM7:Y6 has achieved PCEs as high as 17.0% by the hotcast method, due to the improved open-circuit voltage (VOC). Compared with PM6, the lower HOMO of PM7 increases the gap between ELUMO-donor and EHOMO-acceptor, which is proportional to VOC. This research provides a high PCE for single-junction binary PSCs, which is meaningful for device fabrication related to PM7 and commercialization of PSCs.
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Acknowledgements
This work was supported by Shen Zhen Technology and Innovation Commission (JCYJ20170413173814007, JCYJ 20170818113905024), Hong Kong Research Grants Council (Research Impact Fund R6021-18, 16305915, 16322416, 606012, 16303917) and Hong Kong Innovation and Technology Commission (ITCCNERC14SC01, ITS/471/18). Q. Guo |and ^M.J. Zhang are supported by National Natural Science Foundation of China (51573120, 51973146, 91633301), Collaborative Innovation Center of Suzhou Nano Science & Technology, and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Improved the open-circuit voltage by a chlorinated polymer donor enable binary organic solar cells with efficiencies over 17%
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Ma, R., Liu, T., Luo, Z. et al. Improving open-circuit voltage by a chlorinated polymer donor endows binary organic solar cells efficiencies over 17%. Sci. China Chem. 63, 325–330 (2020). https://doi.org/10.1007/s11426-019-9669-3
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DOI: https://doi.org/10.1007/s11426-019-9669-3