Random Terpolymer Based on Simple Siloxane-functionalized Thiophene Unit Enabling High-performance Non-fullerene Organic Solar Cells  

作　　者：Fuliang Cheng Shiting Lai Yihan Zhang Ling Xue Xinxin Xia Peipei Zhu Xinhui Lu Xunfan Liao Yiwang Chen 

机构地区：[1]National Engineering Research Center for Carbohydrate Synthesis/Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China [2]Department of Physics,Chinese University of Hong Kong New Territories,Hong Kong 999077,China [3]Institute of Polymers and Energy Chemistry(IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry,Nanchang University,Nanchang 330031,China

出　　处：《Chinese Journal of Polymer Science》2024年第3期311-321,I0006,共12页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (NSFC) (Nos.51973032,21905043,51833004 and 52333006);the Jiangxi Provincial Natural Science Foundation (Nos.20212ACB203005,20224ACB214002,20212BAB213018 and 20224BAB203015);the Thousand Talents Plan of Jiangxi Province (No.jxsq2019101051);the Innovation Foundation for graduate students of Jiangxi Normal University (No.YJS2021018);the financial support from Research Grants Council (RGC) of Hong Kong (General Research Fund No.14303519)。

摘　　要：Incorporation of siloxane-functionalized units into polymers backbone has proven to be an efficient strategy to improve photovoltaic performance. In this work, a low-cost siloxane-containing unit was developed to construct a series of terpolymers, and the effects of siloxane on the polymer performance were systematically studied. Different contents of thiophene containing siloxane-functionalized side chain were introduced into PM6 to obtain a series of polymers(PM6, PM6-SiO-10, PM6-SiO-20 and PM6-SiO-30). The siloxane-functionalized side chains in polymers have only a slight effect on the absorption behavior and frontier molecular orbitals. However, when the siloxane content increased, the terpolymers' aggregation property decreased and the temperature-dependency increased, leading to improved donor-acceptor compatibility. The power conversion efficiency(PCE) based on PM6:Y6, PM6-SiO-20:Y6 and PM6-SiO-30:Y6 devices was 15.64%, 16.03% and 15.82%, respectively. In comparison, the active layer based on PM6-SiO-10:Y6 exhibits the most appropriate phase separation morphology, resulting in effective exciton dissociation, more balanced hole-electron transport and less recombination. Consequently, the highest PCE of 16.69% with an outstanding shortcircuit current density of 26.96 mA·cm^(-2) was obtained, which are one of the highest values for siloxane-functionalized polymer-based devices.This work demonstrates that finely controlling the content of siloxane-functionalized thiophene is beneficial for obtaining high-performance terpolymer donors and provides a novel and low-cost method to improve photovoltaic performance.

关 键 词：Organic solar cells TERPOLYMERS Siloxane-functionalized unit Low-cost Morphology 

分 类 号：TQ317[化学工程—高聚物工业] TM914.4[电气工程—电力电子与电力传动]