华中科技大学李忠安团队报道了环锁定策略提高非富勒烯受体二聚化的固有稳定性。相关研究成果发表在2024年12月26日出版的国际知名学术期刊《中国化学》。

近年来，基于非富勒烯受体（NFA）的有机太阳能电池（OSCs）的功率转换效率（PCEs），得到了令人兴奋的发展，但NFA中环外乙烯桥的内在稳定性较差，对其商业化构成了重大挑战。

该文中，研究人员提出了一种新的吡喃锁定策略，可以稳定连接强缺电子2-（3-氧代-2,3-二氢茚-1-亚基）丙二腈端基的环外乙烯桥，基于该策略，成功合成了具有a-Dπ-a-π-D-a结构的两个二聚NFAs（ITBIC-F和TBTBIC-F），与没有环锁定结构的传统NFAs相比，其化学和光化学稳定性显著提高。

基于ITBIC-F和TBTBIC-F的OSCs不仅分别实现了13.03%和10.01%的PCEs，而且显示出良好的器件稳定性。基于ITBIC-F的未封装器件，在氮气气氛中连续加热（85°C）和光照（LED，100 mW·cm^-2）下，分别可以保留其初始PCEs的75%和62%。

附：英文原文

Title: Enhancing the Intrinsic Stability of Nonfullerene Acceptors through Dimerization via Ring-locking Strategy†

Author: Yaxin He, Ji Wan, Xianglang Sun, Jie Min, Zhongan Li

Issue&Volume: 2024-12-26

Abstract: The power conversion efficiencies (PCEs) of non-fullerene acceptor (NFA)-based organic solar cells (OSCs) have undergone an exciting development in recent years, but the poor intrinsic stability of exocyclic ethylene bridges in NFAs poses a significant challenge to their commercialization. In this work, we propose a new pyran-locking strategy that can stabilize the exocyclic ethylene bridge connecting the strong electron-deficient 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end group, based on which two dimerized NFAs (ITBIC-F and TBTBIC-F) with an A-D-π-A-π-D-A structure have been successfully synthesized with significantly improved chemical and photochemical stabilities in comparison with traditional NFAs without the ring-locked structure. The ITBIC-F and TBTBIC-F -based OSCs not only achieve promising PCEs of 13.03% and 10.01%, respectively, but also show good device stability; the ITBIC-F-based unencapsulated devices can retain 75% and 62% of their initial PCEs, respectively, under continuous heat (85 °C) and light irradiation (LED, 100 mW·cm–2) in a nitrogen atmosphere.

DOI: 10.1002/cjoc.202400960

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202400960