High Open-circuit Voltage and Low Voltage Loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene) Acceptor
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2426-6 Chinese J. Polym. Sci.
High Open-circuit Voltage and Low Voltage Loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene) Acceptor Han Hana†, Fu-Jin Baib†, Rong Weia, Han Yub, Yi-Kun Guoa, He Yanb*, and Da-Hui Zhaoa* a Beijing National Laboratory for Molecular Sciences, Centre for the Soft Matter Science and Engineering, The Key Laboratory of Polymer Chemistry and Physics of
the Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China b Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong 999077, China
Electronic Supplementary Information Abstract Reducing the voltage loss (Vloss) is a critical factor in optimizing the open-circuit voltage (Voc) and overall power-conversion efficiency (PCE) of polymer solar cells. In the current work, by designing a novel electron-accepting unit of coronenediimide (CDI) and using it as the main functional building block, a new polymer acceptor CDI-V is developed and applied to fabricate all-polymer solar cells. Compared with the perylenediimide-based polymer acceptors we previously reported, the current CDI-V polymer possesses a noticeably elevated lowest unoccupied molecular orbital (LUMO). Thereby, by virtue of the enlarged energy gap between the donor HOMO and acceptor LUMO, a high Voc value of 1.05 V is achieved by the all-polymer photovolatic device, along with an impressively low Vloss of 0.55 V. As remarkably, in spite of an extremely small LUMO level offset of 0.01 eV exhibited by the donor and acceptor polymers, effective charge separation still takes place in the allpolymer device, as evidenced by a proper short-circuit current (Jsc) of 9.5 mA·cm−2 and a decent PCE of 4.63%. Keywords All-polymer solar cell; Coronenediimide; Voltage loss; Acceptors Citation: Han, H.; Bai, F. J.; Wei, R.; Yu, H.; Guo, Y. K.; Yan, H.; Zhao, D. H. High open-circuit voltage and low voltage loss in all-polymer solar cell with a poly(coronenediimide-vinylene) acceptor. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2426-6
INTRODUCTION Compared with solar cells based on polymer donor allied with fullerene or non-fullerene small-molecule acceptors (SMAs), bulk-heterojunction (BHJ) all-polymer solar cells (all-PSCs) featuring an active layer of a p-type polymer donor blended with n-type polymer acceptor boast the potential advantages of superior morphological stability, mechanical robustness, and better compatibility with large-area printing techniques.[1−6] Although the best power-conversion efficiency (PCE) of all-PSCs has so far lagged behind the SMA-based devices,[7−11] very rapid advancement has been witnessed in this area for the past few years.[12−16] Our group has been focusing on harnessing polycyclic aromatic dicarboximides, particularly perylenediimide (PDI) derivatives, as the main
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