Synergistic Vibrational Suppression and Aggregation Control via a Rigid Dimeric Acceptor for 21.13% Organic Solar Cells.

Authors

Qingao Chen, Chen Zhang, Jinyang Yu, Di Wu, Haiming Zhu, Xianqiang Xie, Shiyong You, Laju Bu, Guanghao Lu, Xunchang Wang, Renqiang Yang, Jiawei Deng, Junjie Zhang, Mingxu Zhou, Shilin Li, Jiali Song, Yanming Sun

Published in

Angewandte Chemie (International ed. in English). Pages e3111048. Sep 22, 2026. Epub Sep 22, 2026.

Abstract

The efficiency bottleneck of organic solar cells (OSCs) is predominantly hindered by severe non-radiative energy loss (ΔE₃), which primarily originates from strong electron-phonon coupling and detrimental charge recombination into darker state traps. Herein, we designed and synthesized a highly rigid and polarized dimeric acceptor, DY-SO by incorporating a sulfone bridged unit. It is revealed that the sulfone bridge's steric hindrance restricts backbone torsion and suppresses molecular vibration, enabling DY-SO with significantly reduced reorganization energy compared to small molecule L8-BO, which reduces non-radiative triplet trapping (CT→T₁) and yields photoluminescence quantum yield (PLQY) of 11.70% and exceptionally low ΔE₃ of 0.149 eV. Upon deploying DY-SO into the D18:L8-BO baseline matrix to evaluate its photovoltaic potential, we further discovered that the inclusion of this rigid dimer successfully tames the film-formation kinetics, effectively suppressing the excessive self-agglomeration inherent to rigid structures and promoting more ordered molecular packing and a favorable phase-separated morphology. Benefiting from these synergistic modulations, the optimal ternary D18:L8-BO:DY-SO OSC achieves an outstanding power conversion efficiency of 21.13% (certified as 20.70%). This work demonstrates that by introducing structurally rigidified, highly polarized dimeric acceptor to suppress molecular vibrational coupling, and mitigate non-radiative dissipation is of great significance for improving the performance of OSCs.

PMID:
42773753
Bibliographic data and abstract were imported from PubMed on 23 Sep 2026.

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