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http://hdl.handle.net/10397/87839
Title: | Synergy of liquid-crystalline small-molecule and polymeric donors delivers uncommon morphology evolution and 16.6% efficiency organic photovoltaics | Authors: | Yan, CQ Tang, H Ma, RJ Zhang, M Liu, T Lv, J Huang, JM Yang, YK Xu, TL Kan, ZP Yan, H Liu, F Lu, SR Li, G |
Issue Date: | 15-Aug-2020 | Source: | Advanced science, 5 Aug. 2020, v. 7, no. 15, 2000149, p. 1-8 | Abstract: | Achieving an ideal morphology is an imperative avenue for enhancing key parameters toward high-performing organic solar cells (OSCs). Among a myriad of morphological-control methods, the strategy of incorporating a third component with structural similarity and crystallinity difference to construct ternary OSCs has emerged as an effective approach to regulate morphology. A nematic liquid-crystalline benzodithiophene terthiophene rhodamine (BTR) molecule, which possesses the same alkylthio-thienyl-substituted benzo moiety but obviously stronger crystallinity compared to classical medium-bandgap polymeric donor PM6, is employed as a third component to construct ternary OSCs based on a PM6:BTR:Y6 system. The doping of BTR (5 wt%) is found to be enough to improve the OSC morphology-significantly enhancing the crystallinity of the photoactive layer while slightly reducing the donor/acceptor phase separation scale simultaneously. Rarely is such a morphology evolution reported. It positively affects the electronic properties of the device-prolongs the carrier lifetime, shortens the photocurrent decay time, facilitates exciton dissociation, charge transport, and collection, and ultimately boosts the power conversion efficiency from 15.7% to 16.6%. This result demonstrates that the successful synergy of liquid-crystalline small-molecule and polymeric donors delicately adjusts the active-layer morphology and refines device performance, which brings vibrancy to the OSC research field. | Keywords: | Liquid-crystalline molecules Morphology Organic solar cells Ternary structures |
Publisher: | Wiley-VCH | Journal: | Advanced science | ISSN: | 2198-3844 | DOI: | 10.1002/advs.202000149 | Rights: | © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The following publication Yan, C. Q. , Tang, H. , Ma, R. J. , Zhang, M. , Liu, T. , Lv, J. , . . . Lu, S. R. (2020). Synergy of liquid-crystalline small-molecule and polymeric donors delivers uncommon morphology evolution and 16.6% efficiency organic photovoltaics. Advanced Science, 7(15), 2000149, 1-8 is available at https://dx.doi.org/10.1002/advs.202000149 |
Appears in Collections: | Journal/Magazine Article |
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Yan_Synergy_Liquid-Crystalline_Small-Molecule.pdf | 3.49 MB | Adobe PDF | View/Open |
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