Trialkylsilyl-thiophene-conjugated acceptor for efficient organic solar cells compatible with spin-coating and blade-coating technologies
作者机构：State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University College of Chemistry and Molecular Engineering Peking University School of Materials Science and Engineering Xi'an University of Science and Technology Jiangsu Engineering Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications School of Materials Science and Engineering and Changzhou University The Institute for Advanced Studies Wuhan University Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences
出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))
年 卷 期：2024年
核心收录：
学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the National Natural Science Foundation of China (22209131, 22005121, 21875182, 52173023) the National Key Research and Development Program of China (2022YFE0132400) the Key Scientific and Technological Innovation Team Project of Shaanxi Province (2020TD-002) the 111 Project 2.0 (BP0618008)
摘 要：Sidechain engineering as an efficient and convenient strategy has been widely used to optimize molecular structure of photovoltaic materials for boosting power conversion efficiency(PCE) of organic solar cells(OSCs). Herein, a new Y-series acceptor named Y-ThSi with trialkylsilyl-substituted thiophene as conjugated sidechain is developed. Compared with its parental Y6 with multiple intermolecular interactions, Y-ThSi has a unitary molecular packing due to the additional steric hindrance from twodimensional(2D)-conjugated trialkylsilyl-thiophene. Therefore, Y-ThSi shows an obviously blue-shifted absorption with an onset of ～850 nm but significantly up-shifted lowest unoccupied molecular orbital energy level. For the PM6:Y-ThSi pair, the spin-coating OSCs achieve a decent PCE of 14.56% with an impressively high photovoltage(VOC) of 0.936 V. Inspired by its high VOCand narrow absorption, Y-ThSi is introduced into near-infrared absorbing binary PM6:BTP-eC9 host to construct ternary OSCs. Thanks to the complementary absorption, optimized morphology, and minimized energy loss properties, the PM6:BTP-eC9:Y-ThSi-based OSCs offer a higher PCE of 18.34%. Moreover, our developed strategy can overcome the commonly existed PCE drop when the blade-coating towards large-scale printing is used instead. Therefore, a comparable PCE of 18.34% is achieved, which is one of the best values for the blade-coating OSCs so far.
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