Angew: Nearly 19% Efficient! Electron Configuration Tuning of Centrally Extended Non-Fullerene Acceptors for Organic Solar Cells
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In the molecular optimization of non-fullerene acceptors (NFAs), extending the central core can tune energy levels, reduce non-radiative energy losses, enhance intramolecular (donor-acceptor and acceptor-acceptor) stacking, facilitate charge transfer, and improve device performance. In this study, Prof. Chen Yongsheng from Nankai University, Bin Kan, Cheng Zhong from Wuhan University adopted a new strategy to synthesize acceptors with conjugated electron-deficient extended cores.
Among them, the acceptor CHBBQ embedding benzobisthiadiazole exhibited optimal original fibril network morphology, enhanced crystallinity, and improved charge generation/transport in the blend films, leading to a high power conversion efficiency of 18.94% for ternary organic solar cells based on CH-BBQ (18.19% for binary OSCs) attributed to its delicate structural design and electronic configuration tuning.
The researchers systematically investigated the impacts of the central electron-deficient core on acceptor properties and device performance using experimental and theoretical methods. Modulating electron-deficient cores for NFAs opens new avenues for molecular engineering and promotes related research.
The measurements in this study were performed using Enlitech SS-F5-3A products.
This article was published on August 30, 2023. The original source is Knowledge Valley.
Tainan Duan, et al, Electronic Configuration Tuning of Centrally Extended Non Fullerene Acceptors Enabling Organic Solar Cells with Efficiency Approaching 19%, Angew. Chem. Int. Ed. 2023, e202308832
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