High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having pi-Extended Units with Broad Near-IR Absorption
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要We report two new poly-small-molecule acceptors, PYN-BDT and PYN-BDTF, which serve, by virtue of their p-extended naphthalene rings, as broad optical cross-section macromolecular absorbers (extending to similar to 900 nm; Delta E-opticalgap = 1.38 eV) in all-polymer solar cells (APSCs). APSCs fabricated by blending PYN-BDT or PYN-BDTF with PM6 exhibit power conversion efficiencies (PCEs) of 7.24 and 9.08%, respectively, while blends with PBDB-T exhibits far higher PCEs of 12.06 and 13.22%, respectively; the latter cell achieves J(sc) = 22.28 mA cm(-2), among the highest known for an APSC. The results of blend morphology, GIWAXS, charge transport, exciton and carrier dynamics, PL quenching efficiency, and impedance-based analysis indicate that the PBDB-TT:PYN-BDTF blends and their APSCs outperform the corresponding PM6:PYN-BDTF devices due to significantly suppressed bimolecular recombination. These results demonstrate that pi-conjugative extension of individual polymer acceptor blocks represents an efficient strategy to broaden APSC optical cross sections, decrease bimolecular recombination, and achieve high-performance cells with enhanced J(sc) metrics.
著者Su N, Ma RJ, Li GP, Liu T, Feng LW, Lin CJ, Chen JH, Song J, Xiao YQ, Qu JL, Lu XH, Sangwan VK, Hersam MC, Yan H, Facchetti A, Marks TJ
期刊名稱ACS Energy Letters
出版年份2021
月份2
卷號6
期次2
出版社AMER CHEMICAL SOC
頁次728 - 738
國際標準期刊號2380-8195
語言英式英語
Web of Science 學科類別Chemistry, Physical;Electrochemistry;Energy & Fuels;Nanoscience & Nanotechnology;Materials Science, Multidisciplinary;Chemistry;Electrochemistry;Energy & Fuels;Science & Technology - Other Topics;Materials Science

上次更新時間 2021-14-06 於 00:09