Semicrystalline Unfused Polymer Donors with Backbone Halogenation toward Cost-Effective Organic Solar Cells  

作　　者：Yuxin Kong Shijie Ju Hongmei Qin Min Hun Jee Simeng Xia Jiaqi Ren Chao Gao Jianyu Yuan Wenyan Su Han Young Woo Yuxiang Li 

机构地区：[1]School of Materials Science and Engineering,Xi'an University of Science and Technology,Xian,Shaanxi 710054,China [2]Department of Chemistry,Korea University,Seoul 02841,Republic of Korea [3]Xi'an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials,State Key Laboratory of Fluorine&Nitrogen Chemicals,Xi'an Modern Chemistry Research Institute,Xi'an,Shaanxi 710065,China [4]Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Institute of Functional Nano&Soft Materials(FUNSOM),Soochow University,199 Ren'ai Road,Suzhou,Jiangsu 215123,China

出　　处：《Chinese Journal of Chemistry》2024年第7期752-759,共8页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (52203241,21905225,22005121);the Science and Technology Program of Shaanxi Province (2022JM-229,2023-JC-QN-0448);Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University (KJS2208);H.Y.W.acknowledges the financial support from the National Research Foundation of Korea (2019R1A6A1A11044070,2020M3H4A3081814).

摘　　要：Developing novel unfused building blocks with simple synthesis and low cost is essential to advance and enrich cost-effective poly-mer donors;however,it remains a challenge due to the lack of efficient molecular strategies.Herein,a class of low-cost and fully unfused polymer donors with precisely regulated backbone planarity via halogenation was designed and synthesized,namely PDTBTBz-2H,PDTBTBz-2F,and PDTBTBz-2Cl.These polymer donors possess a four-step synthesis route with over 80%yield from cheap raw chemicals comparable to existing low-cost polymer donors,such as PTQ10.Benefitting from the planar backbone via in-corporating the F…S non-covalent interactions,PDTBTBz-2F exhibits more robust J-type aggregation in solution and a long-ranged molecular stacking in film relative to PDTBTBz-2H and PDTBTBz-2Cl.Moreover,the systematical study of PDTBTBz-based organic so-lar cells(OSCs)reveals the close relationship between optimized molecular self-assembly and charge separation/transport regarding backbone halogenation when paired with the non-fullerene acceptor(Y6-BO-4F).As a result,the photovoltaic devices based on semicrystalline PDTBTBz-2F achieved a promising power conversion efficiency(PCE)of 12.37%.Our work highlighted the influence of backbone halogenation on the molecular self-assembly properties and a potential unfused backbone motif for further developing cost-effective OSCs.

关 键 词：Low-cost Polymer donors Backbone halogenation Molecular self-assembly Organic solar cells 

分 类 号：O63[理学—高分子化学]