From 1D to 3D: A Systematic Study of Dibenzene Derivatives as Additives for Morphology and Performance Optimization in Organic Solar Cells†
Jintong Sun , Lei Xiao , Lian Zhong , Zhe Sun , Thi Le Huyen Mai , Duoling Cao , Silu Huang , Weijie Ding , Qianguang Yang , Zedong Lin , Zhipeng Kan , Zhi-Guo Zhang , Changduk Yang , Shirong Lu
Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (14) : 2305 -2314.
Introducing volatile solid additives into the active layer of organic solar cells (OSCs) is a widely used approach to improving power conversion efficiency (PCE). The molecular conformation of these additives plays a crucial role in determining the molecular packing behavior and phase separation of the active layer. In this study, we systematically explore the effects of three different dimensions-dibenzene derivatives solid additives—one-dimensional (1D) linear diphenylacetylene (DNE), two-dimensional (2D) planar trans-stilbene (SNE), and three-dimensional (3D) stereoscopic 1,2-diphenylethane (DLE)—on device performance. Compared to the 3D additive DLE, both 1D DNE and 2D SNE show stronger interactions with the acceptor and promote its molecular packing. However, this induces an absorption red shift that significantly lowers open-circuit voltage (VOC). In contrast, DLE retains a higher VOC (0.887 V) due to minimal spectral shift and mitigates the VOC-short-circuit current density (JSC) trade-off, thereby reaching a PCE of 19.62% in the PM6:L8-BO system. Moreover, as a non-halogenated additive processed with the green solvent toluene, DLE enables a high PCE of 19.33% in the PM6:BTP-ec9 system, highlighting its promising potential for practical applications. Our findings establish a broadly applicable framework for understanding and harnessing conformation effects in solid additives to enhance OSC efficiency.
Organic solar cells / Molecular conformation / Volatile solid additives / Morphology regulation / Photovoltaic properties
2026 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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