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Optimizing polymer aggregation and blend morphology for boosting the photovoltaic performance of polymer solar cells via a random terpolymerization strategy

查看全文 作　　者：Tao [1]Zhang;Cunbin [1]An;Qianglong [1]Lv;Jinzhao [1,2]Qin;Yong [1]Cui;Zhong [1]Zheng;Bowei [1]Xu;Shaoqing [1]Zhang;Jianqi [3]Zhang;Chang [1]He;Jianhui [1,2]Hou 高影响力作者 机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,100190 Beijing,China;[2]University of Chinese Academy of Sciences,100049 Beijing,China;[3]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,100190 Beijing,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第8期,共9页高影响力期刊 基　　金：the financial support from the National Natural Science Foundation of China(Grant Nos.51703228,51673201,21835006);Beijing National Laboratory for Molecular Sciences(BNLMS-CXXM-201903)。 摘　　要：Compared to regular conjugated polymers,the random conjugated terpolymers are usually not beneficial to achieve highly efficient non-fullerene(NF)-based polymer solar cells(PSCs)due to their disordered chemical structures.In this work,we report two random terpolymer donors(PBNB80 and PBNB50)by tuning the molar ratio of electron-accepting units of 1,3-di(thiophen-2-yl)naphtho[2,3-c]thiophene-4,9-dione(NTD)and 1,3-bis(4-chlorothiophen-2-yl)-4 H,8 H-benzo[1,2-c:4,5-c’]dithiophene-4,8-dione(ClBDD),at the same time,the parent polymers(PBNB100 and PBNB00)are also compared to study.These four polymer donors exhibit similar optical bandgaps and gradually deepen highest occupied molecular orbital levels.Importantly,aggregation and self-organization properties of the random terpolymer donors are optimized,which result in the better morphology and crystal coherence length after blending with NF acceptor of BO-4 Cl.Particularly,a PBNB80:BO-4 Cl blend forms an optimal nanoscale phase-separation morphology,thereby producing an outstanding power conversion efficiency of 16.0%,which is much higher than those(12.8%and 10.7%)of their parent binary polymer donor-based devices.This work demonstrates that rational using terpolymerization strategy to prepare random terpolymer is a very important method to achieve highly efficient NF-PSCs. 关 键 词：Polymer solar cells Random terpolymer Non-fullerene acceptor Naphtho[2,3-c]thiophene-4,9-dione Morphology
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