Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency

Hong-Li Wang; Zhao-Long Liu; Xing-Jian Dai; Jia-Hao Zhang; Chen-Tong Liao; Xiao-Peng Xu; Yi-Hui Wu; Qiang Peng

doi:10.1007/s10118-026-3789-0

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Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency

RESEARCH ARTICLE | Updated：2026-09-29

- Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency
- Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency
- Chinese Journal of Polymer Science 2026年44卷页码：1-11
- Affiliations：
  
  a.School of Chemical Engineering and State Key Laboratory of Advanced Polymer Materials, Sichuan University, Chengdu 610065, China
  b.College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
- Author bio：
  
  xpxu@scu.edu.cn (X.P.X.)
  qiangpeng@scu.edu.cn (Q.P.)
- Funds：
  
  This work was financially supported by the National Key Research and Development Program of China (No. 2022YFB4200500), the National Natural Science Foundation of China (Nos. 22422904, 22379101 and 225B2912), Sichuan Natural Science Foundation (Nos. 2024NSFSC0001 and 2025ZNSFSC0960). The authors also thank Yanping Huang from Center of Engineering Experimental Teaching, School of Chemical Engineering, Sichuan University for the help of NMR measurements.;The authors declare no interest conflict.Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-026-3789-0.Data supporting the findings of this study are available from the corresponding author upon reasonable request.
- DOI：10.1007/s10118-026-3789-0
  中图分类号： [M
- 收稿：2026-04-16，
  
  修回：2026-05-29，
  
  录用：2026-06-17，
  
  网络首发：2026-09-29，
  
  纸质出版：2026-08
- Accepted：
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Wang, H. L.; Liu, Z. L.; Dai, X. J.; Zhang, J. H.; Liao, C. T.; Xu, X. P.; Wu, Y. H.; Peng, Q. Chalcogen atom engineering of conjugated side chains enables additive-free organic solar cells with 20.58% efficiency. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3789-0

Hong-Li Wang, Zhao-Long Liu, Xing-Jian Dai, et al. Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency[J/OL]. Chinese Journal of Polymer Science, 2026, 441-11.
Wang, H. L.; Liu, Z. L.; Dai, X. J.; Zhang, J. H.; Liao, C. T.; Xu, X. P.; Wu, Y. H.; Peng, Q. Chalcogen atom engineering of conjugated side chains enables additive-free organic solar cells with 20.58% efficiency. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3789-0 DOI：

Hong-Li Wang, Zhao-Long Liu, Xing-Jian Dai, et al. Chalcogen Atom Engineering of Conjugated Side Chains Enables Additive-free Organic Solar Cells with 20.58% Efficiency[J/OL]. Chinese Journal of Polymer Science, 2026, 441-11. DOI： 10.1007/s10118-026-3789-0.

摘要

Abstract

Achieving optimal active-layer morphology in organic solar cells (OSCs) without volatile additives is critical for long-term operational stability. This study introduces a rational molecular design strategy utilizing chalcogen-engineered two-dimensional (2D) side chains to intrinsically regulate non-fullerene acceptor (NFA) packing. We synthesized three novel NFAs

BTP-OTh

BTP-STh

and BTP-SeTh

to systematically decode the impact of heteroatomic polarizability on device performance. The incorporation of highly polarizable selenium atoms in BTP-SeTh effectively enhances the local dielectric constant (

) and suppresses the exciton binding energy (

) through intensified dielectric screening. Consequently

deploying BTP-SeTh as a morphology-regulating ternary component in the D18/L8-BO system yields an exceptional power conversion efficiency (PCE) of 20.58%

via

an entirely additive-free fabrication process. This work establishes chalcogen-substituted 2D side chains as a robust molecular blueprint for developing high-performance

intrinsically stable

and additive-free organic photovoltaics.

关键词

Keywords

references

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