Trialkylsilyl-thiophene-conjugated acceptor for efficient organic solar cells compatible with spin-coating and blade-coating technologies  

作　　者：Tengfei Li Qiang Wu Ze-Fan Yao Hairui Bai Wenyan Su Rui Sun Lingxiao Tang Zhaozhao Bi Xiaojun Li Weiguo Zhu Jie Min Qunping Fan Wei Ma 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [2]School of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China [3]Jiangsu Engineering Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications,School of Materials Science and Engineering,and Changzhou University,Changzhou 213164,China [4]College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China [5]The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China [6]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China Chemistry》2024年第12期4184-4193,共10页中国科学（化学英文版）

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-Th Si with trialkylsilyl-substituted thiophene as conjugated sidechain is developed.Compared with its parental Y6 with multiple intermolecular interactions,Y-Th Si has a unitary molecular packing due to the additional steric hindrance from twodimensional(2D)-conjugated trialkylsilyl-thiophene.Therefore,Y-Th Si 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-Th Si pair,the spin-coating OSCs achieve a decent PCE of 14.56%with an impressively high photovoltage(V_(OC))of 0.936 V.Inspired by its high V_(OC)and narrow absorption,Y-Th Si 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-e C9:Y-Th Si-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.

关 键 词：sidechain engineering organic solar cells blade-coating SPIN-COATING power conversion efficiency 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]