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

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

doi:10.1007/s10118-023-3051-y

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

RESEARCH ARTICLE | Updated：2024-02-20

- Random Terpolymer Based on Simple Siloxane-functionalized Thiophene Unit Enabling High-performance Non-fullerene Organic Solar Cells
- Random Terpolymer Based on Simple Siloxane-functionalized Thiophene Unit Enabling High-performance Non-fullerene Organic Solar Cells
- 高分子科学（英文版） 2024年42卷第3期页码：311-321
- Affiliations：
  
  a.National Engineering Research Center for Carbohydrate Synthesis/Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry ofEducation, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
  b.Department of Physics, Chinese University of Hong Kong New Territories, Hong Kong 999077, China
  c.Institute of Polymers and Energy Chemistry (IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, Nanchang 330031, China
- Author bio：
  
  xfliao@jxnu.edu.cn (X.L.)
  ywchen@ncu.edu.cn (Y.C.)
- Funds：
  
  This work was 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), and the Innovation Foundation for graduate students of Jiangxi Normal University (No. YJS2021018). X.X. and X.L. acknowledge the financial support from Research Grants Council (RGC) of Hong Kong (General Research Fund No. 14303519).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-023-3051-y.
- DOI：10.1007/s10118-023-3051-y
  中图分类号：
- 收稿：2023-07-20，
  
  修回：2023-9-7，
  
  录用：2023-9-8，
  
  网络首发：2023-11-02，
  
  纸质出版：2024-03-01
- Accepted：
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Cheng, F.; Lai, S.; Zhang, Y.; Xue, L.; Xia, X.; Zhu, P.; Lu, X.; Liao, X.; Chen, Y. Random terpolymer based on simple siloxane-functionalized thiophene unit enabling high-performance non-fullerene organic solar cells. Chinese J. Polym. Sci. 2024, 42, 311–321

Fuliang Cheng, Shiting Lai, Yihan Zhang, et al. Random Terpolymer Based on Simple Siloxane-functionalized Thiophene Unit Enabling High-performance Non-fullerene Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2024, 42(3): 311-321.
Cheng, F.; Lai, S.; Zhang, Y.; Xue, L.; Xia, X.; Zhu, P.; Lu, X.; Liao, X.; Chen, Y. Random terpolymer based on simple siloxane-functionalized thiophene unit enabling high-performance non-fullerene organic solar cells. Chinese J. Polym. Sci. 2024, 42, 311–321 DOI： 10.1007/s10118-023-3051-y.

Fuliang Cheng, Shiting Lai, Yihan Zhang, et al. Random Terpolymer Based on Simple Siloxane-functionalized Thiophene Unit Enabling High-performance Non-fullerene Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2024, 42(3): 311-321. DOI： 10.1007/s10118-023-3051-y.

摘要

Thiophene with siloxane-functionalized side chain unit was synthesized and introduced into polymer PM6 to fine-tune morphology of the active layer of OSCs and obtain outstanding

. The PM6-SiO-10:Y6 active layer exhibits the most appropriate phase separation morphology and obtained the PCE of 16.69%

which is one of the highest value for siloxane-functionalized polymer-based binary OSCs.

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 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 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 terpolymer donors and provides a novel and low-cost method to improve photovoltaic performance.

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