Abstract
The incorporation of an additional component into the bulk-heterojunction light-harvesting layer of polymer solar cells has been considered as an effective strategy to enhance photovoltaic performance. Here we demonstrated that the photovoltaic parameters of all-polymer solar cells could be enhanced upon replacing a certain ratio of electron-donating polymer PTzBI-oF with a widely used wide-bandgap polymer donor PM6. The photoluminescent characterizations confirmed the Förster resonance energy transfer from incorporated PM6 to PTzBI-oF. Moreover, the combination of Fourier-transform photocurrent spectroscopy and electroluminescence external quantum efficiencies measurements demonstrated reduced non-radiative recombination energy loss upon the incorporation of PM6, resulting in a slightly enhanced open-circuit voltage of 0.88 V of the ternary cell regarding the binary PTzBI-oF:PFA1 device. The optimized ternary blend devices comprising of PTzBI-oF:PM6:PFA1 presented an impressively high power conversion efficiency of 16.3%, and the efficiency remains 15% on a device with an enlarged effective area of 1 cm2, demonstrating the great potential of these all-PSCs for potential applications.
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This work was supported by the National Natural Science Foundation of China (21822505), Guangdong Natural Science Foundation (2017A030306011, 2019B030302007) and the National Key Research and Development Program of China (2019YFA0705900).
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An, K., Peng, F., Zhong, W. et al. Improving photovoltaic parameters of all-polymer solar cells through integrating two polymeric donors. Sci. China Chem. 64, 2010–2016 (2021). https://doi.org/10.1007/s11426-021-1078-5
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DOI: https://doi.org/10.1007/s11426-021-1078-5