Citation: Xinhao Zhong, Lingling Zhan, Yaxin Yang, Lu Wei, Tianyi Chen, Rui Sun, Jie Min, Hongxiang Li, Pei Cheng, Shouchun Yin, Hongzheng Chen. Dual-functional solid additives enable morphology and energy loss regulation for high-efficiency and stable organic photovoltaics[J]. Chinese Chemical Letters, ;2026, 37(9): 112029. doi: 10.1016/j.cclet.2025.112029 shu

Dual-functional solid additives enable morphology and energy loss regulation for high-efficiency and stable organic photovoltaics

Xinhao Zhong ^a ,
Lingling Zhan ^{a, *,} ,
Yaxin Yang ^a ,
Lu Wei ^a ,
Tianyi Chen ^b ,
Rui Sun ^c ,
Jie Min ^c ,
Hongxiang Li ^d ,
Pei Cheng ^d ,
Shouchun Yin ^{a, *,} ,
Hongzheng Chen ^b

a.
Key Laboratory of Organosilicon Chemistry and Materials Technology of Ministry of Education, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
b.
State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
c.
The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
d.
College of Polymer Science and Engineering, National Key Laboratory of Advanced Polymer Materials, Sichuan University, Chengdu 610065, China

linglingzhan@hznu.edu.cn

yinsc@hznu.edu.cn

Received Date: 8 August 2025
Revised Date: 23 October 2025
Accepted Date: 27 October 2025
Available Online: 28 October 2025

Figures(3)

Solid additives have emerged as effective tools for morphology regulation in organic photovoltaics (OPVs), yet simultaneous control over donor and acceptor domains remains challenging. Here, we report a dual-functional solid additive, NSA2, designed to optimize vertical phase distribution and suppress energy loss in PM6:Y6 systems. Compared to the control device with a power conversion efficiency (PCE) of 16.28%, NSA2-incorporated devices achieve a PCE of 18.51%, and up to 19.31% using a layer-by-layer structure with co-additive (DIB). Detailed characterization reveals improved π-π stacking, prolonged crystallization, reduced trap-assisted and bimolecular recombination, and enhanced charge transport. Notably, the non-radiative energy loss (ΔE3) is reduced from 0.214 eV to 0.204 eV, contributing to higher open-circuit voltage. The additive also improves device stability and shows broad compatibility, across other acceptor systems (BTP-eC9-based binary device), achieving PCE of 19.68%. This work demonstrates a general and scalable strategy for designing multifunctional solid additives to boost efficiency and stability in high-performance OPVs.
- Solid-additives,
- Dual-functional,
- Vertical phase distribution,
- High efficiencies,
- Stability
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