华中科技大学胡华伟团队报道了非富勒烯受体中硒功能化的精确控制实现高效有机太阳能电池。相关研究成果于2022年9月20日发表在《德国应用化学》。

非富勒烯小分子受体（NF-SMA）的中心π核工程在提高有机太阳能电池（OSCs）性能方面是有效的。特别是，NF-SMAs的硒（Se）功能化被认为是一种很有前景的策略，但结构-性能关系尚不清楚。

该文中，研究人员合成了两种具有不同取代位置的异构烷基苯基取代的硒代酚[3,2-b]噻吩基NF-SMAs，分别命名为mPh4F-TS和mPh4F-ST，并与噻吩[3,2-b]噻吩基类似物mPh4F-TT进行了对比。当将硒原子放置在π核的外部位置时，mPh4F-TS显示出最大的红移吸收和紧密的分子堆积。PM6:mPh4F-TS器件具有优异的吸收、高电荷载流子迁移率和降低的能量损失。因此，PM6:mPh4F-TS实现了更平衡的光伏参数，并产生了18.05%的效率，突出表明，精确操纵硒是实现高效OSCs的可行方法。

附：英文原文

Title: Precise Control of Selenium Functionalization in Non-Fullerene Acceptors Enabling High-Efficiency Organic Solar Cells

Author: Jianquan Zhang, Siwei Luo, Heng Zhao, Xiaoyun Xu, Xinhui Zou, Ao Shang, Jiaen Liang, Fujin Bai, Yuzhong Chen, Kam Sing Wong, Zaifei Ma, Wei Ma, Huawei Hu, Yiwang Chen, He Yan

Issue&Volume: 2022-09-20

Abstract: Central π-core engineering of non-fullerene small molecule acceptors (NF-SMAs) is effective in boosting the performance of organic solar cells (OSCs). Especially, selenium (Se) functionalization of NF-SMAs is considered a promising strategy but the structure-performance relationship remain unclear. Here, we synthesize two isomeric alkylphenyl-substituted selenopheno[3,2-b]thiophene-based NF-SMAs named mPh4F-TS and mPh4F-ST with different substitution positions, and contrast them with the thieno[3,2-b]thiophene-based analogue, mPh4F-TT. When placing Se atoms at the outer positions of the π-core, mPh4F-TS shows the most red-shifted absorption and compact molecular stacking. The PM6:mPh4F-TS devices exhibit excellent absorption, high charge carrier mobility, and reduced energy loss. Consequently, PM6:mPh4F-TS achieves more balanced photovoltaic parameters and yields an efficiency of 18.05%, which highlights that precisely manipulating Se is a practicable way toward high-efficiency OSCs.

DOI: 10.1002/anie.202206930

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202206930