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    Constructing a Double-Cable Polymer Acceptor for Efficient All- Polymer Solar Cells with a Non-Radiative Recombination Energy Loss of 0.16 eV

    Year: 2022

    Journal: Chem. Mat., Volume 34, NOV 22, page 9970–9981

    Authors: Wang, Tao; Sun, Rui; Wu, Yao; Wang, Wei; Zhang, Meimei; Min, Jie

    Organizations: National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; [52061135206]; [22279094]

    While vigorous progress with all-polymer solar cells (all-PSCs) has been achieved, the power conversion efficiency (PCE) of all-PSCs is significantly suppressed by polymer acceptors (PAs) that are short on broad light harvesting, high electron mobility, and low energy loss. Here, we demonstrate a promising design strategy to synthesize a graft-structural double-cable polythiophene-based conjugated PA PT-YTz based on a fused-ring benzotriazole-based small-molecule acceptor framework as a pendant side unit. PT-YTz possesses an intensified and extended absorption spectrum, enhanced electron mobility, and favorable active layer morphology when blended with PM6. The optimized PM6/PT-YTz all-PSCs exhibit a high PCE of 16.15% with an energy loss of 0.49 eV and a remarkably low non-radiative voltage loss of only 0.16 eV. This work enables new design directions and strategies to construct narrow band gap PAs toward successful applications in high-performance all-PSCs.
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