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

Fuliang Cheng ¹Shiting Lai ¹Yihan Zhang ¹Ling Xue ¹Xinxin Xia ²Peipei Zhu ¹Xinhui Lu ²Xunfan Liao ¹Yiwang Chen³

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作者信息

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. 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;Institute of Polymers and Energy Chemistry(IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry,Nanchang University,Nanchang 330031,China
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Abstract

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 intro-duced 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 poly-mers have only a slight effect on the absorption behavior and frontier molecular orbitals.However,when the siloxane content increased,the ter-polymers'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 1 5.64％,1 6.03％and 1 5.82％,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 1 6.69％with an outstanding short-circuit 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 ter-polymer donors and provides a novel and low-cost method to improve photovoltaic performance.

Key words

Organic solar cells/Terpolymers/Siloxane-functionalized unit/Low-cost/Morphology

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基金项目

National Natural Science Foundation of China(NSFC)(51973032)

National Natural Science Foundation of China(NSFC)(21905043)

National Natural Science Foundation of China(NSFC)(51833004)

National Natural Science Foundation of China(NSFC)(52333006)

Jiangxi Provincial Natural Science Foundation(20212ACB203005)

Jiangxi Provincial Natural Science Foundation(20224ACB214002)

Jiangxi Provincial Natural Science Foundation(20212BAB213018)

Jiangxi Provincial Natural Science Foundation(20224BAB203015)

Thousand Talents Plan of Jiangxi Province(jxsq2019101051)

Innovation Foundation for graduate students of Jiangxi Normal University(YJS2021018)

Research Grants Council(RGC)of Hong Kong(General Research Fund)(14303519)

出版年

2024

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCDCSCD

影响因子：0.721

ISSN：0256-7679

参考文献量54

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