Morphological Modulation by Solid Additive Enables High-Efficiency Organic Solar Cells with Extended Exciton Diffusion
Wei Zheng , Zekun Liu , Jiang Wu , Mengan Zhao , Xuming Liu , Hangping Qiu , Yingying Fu , Zhiyuan Xie
Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (8) : 1161 -1170.
The active layer of organic solar cells (OSCs), which processed from volatile and toxic solvents, poses significant challenges for the spontaneous formation of an optimal morphology during the film-forming process. Herein, a non-halogenated solid additive, diphenyl disulfide (DPDS), is employed to enhance the exciton dynamics and photovoltaic performance of OSCs through a two-step aggregation process. Detailed characterization reveals that intermolecular interactions between DPDS and the structural units of L8-BO lead to more pronounced fibrillation of acceptor, a reduced π-π stacking distance, and an extended exciton diffusion length. The ternary OSCs incorporating DPDS additive achieve a power conversion efficiency (PCE) of 19.3% and a fill factor of 80.3%, significantly outperforming the control devices. Notably, the ternary devices processed from both non-halogenated solvent and additive demonstrate no significant loss compared to its halogenated counterparts. This study provides new insights into additive-directed morphology control and offers a promising strategy for the development of high-performance OSCs.
Organic solar cells / Solid additive / Morphology control / Exciton dynamics / Aggregation / π-π stacking
2026 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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