journal article·2025-06

Suppression of Charge Recombination Induced by Solid Additive Assisting Organic Solar Cells with Efficiency over 20%

Lingzhi Guo, Jiali Song, Jiawei Deng, Jiawei Qiao, Jianqi Zhang, Chao Li, Songyang Yuan, Bingyu Han, Min Hun Jee, Zhongwei Ge, Cen Zhang, Guanghao Lu, Xiaotao Hao, Han Young Woo, Yanming Sun

Advanced Materials· Volume 37· Issue 24
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Abstract

Abstract A volatile solid additive strategy, which can effectively optimize the morphology of the photoactive layer with an ideal domain size and purity, has emerged as a promising approach to improve the photovoltaic performance of organic solar cells (OSCs). However, the precise role of solid additives in modulating charge and exciton dynamics, especially the recombination process, remains not fully understand. In this study, a solid additive, 1,4‐diiodo‐2,5‐dimethoxybenzene (DIDOB), is developed to improve the photovoltaic performance of OSCs and conduct a comprehensive investigation into its effect on the charge recombination process. As a result, the PM6:L8‐BO‐X‐based binary OSC processed with DIDOB achieves an excellent efficiency of 19.75% with a remarkable fill factor of 81.9%, owing to the optimal fiber network morphology, tighter and ordered molecular packing, as well as the suppression of both bimolecular and geminate recombination. Notably, the DIDOB exhibits broad universality as an additive in other non‐fullerene acceptor‐based OSCs. Impressively, the D18:PM6:L8‐BO‐based ternary device processed with DIDOB yielded an excellent efficiency of 20.11% (certified as 20.03%). This work highlights the effect of the solid additive on the charge recombination process within active layer and provides insights for the further development of OSCs.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Hangzhou International Innovation Institute Beihang University Hangzhou 311115 P. R. China

School of Chemistry Beihang University Beijing 100191 P. R. China

School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China

CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 P. R. China

Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong 999077 P. R. China

School of Chemistry Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Guangdong Provincial Engineering Technology Research Center for Materials for Energy Conversion and Storage South China Normal University (SCNU) Guangzhou 510006 P. R. China

School of Chemistry Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China

Department of Chemistry College of Science Korea University Seoul 02841 Republic of Korea

Funding

National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality

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