Multiselenophene-Substituted Propeller-Shaped Trimeric Acceptor for Efficient Organic Solar Cells

作者：Yuyang Bai, H. J. Yang, Jia Wang, Baofa Lan, Tianqi Chen, Yong Huo, Bin Kan · 发表于：Chemistry of Materials · 年份：2025 · DOI：10.1021/acs.chemmater.5c02690 · 被引用次数：1 · 研究领域：Organic Electronics and Photovoltaics、Luminescence and Fluorescent Materials、Organic Light-Emitting Diodes Research

The development of high-performance trimer acceptors (TMAs) for organic solar cells (OSCs) is often hampered by their blue-shifted absorption spectra. Consequently, to overcome this limitation and enhance device performance, we designed two propeller-shaped TMAs, TYSe-1 and TYSe-2, employing a multiselenophene strategy to achieve the desired redshift in absorption. In addition, side-chain isomerization was employed to tune the molecular packing and aggregation. The linear nonyl chains in TYSe-1 enabled tighter intermolecular stacking than the branched chains in TYSe-2, thus yielding an optimized blend morphology that enhanced exciton dissociation, charge transport, and charge extraction. Combined with its efficient absorption, TYSe-1-based OSCs achieved an outstanding short-circuit current density ( J SC ) value of 26.53 mA cm –2, ranking among the highest reported for TMA-based devices. Moreover, TYSe-1 exhibited higher electroluminescence quantum efficiency, leading to suppressed nonradiative recombination loss (Δ E 3 ) and reduced overall energy loss. With an open-circuit voltage ( V OC ) value of approximately 0.857 V and an exceptional J SC value, TYSe-1-based OSCs attained a notable power conversion efficiency of 16.84%. These findings underscore the significant potential of the multiselenophene approach in designing red-shifted, high-performance TMA-based organic photovoltaics.