Wang Xiaodong, Wei Nan, Cheng Yetai, Zhang Andong, Bian Ziqing, Lu Hao, Zhu Xiangwei, Liu Yahui, Wei Yaoyao, Bo Zhishan
College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China.
College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, China.
Mater Horiz. 2024 Nov 25;11(23):6019-6027. doi: 10.1039/d4mh01113a.
In this study, we designed and synthesized two NFREAs, 2BTh-3F and 2BTh-CN, incorporating distinct substituents to modulate their electron-withdrawing properties. We meticulously explore the distinct impacts of these substituents on NFREA performance. Our investigation revealed that the introduction of 3,5-difluoro-4-cyanophenyl in 2BTh-CN significantly enhanced electron withdrawal and intramolecular charge transfer, leading to a red-shifted absorption spectrum and optimized energy levels. Consequently, organic solar cells (OSCs) utilizing 2BTh-CN demonstrate a notable power conversion efficiency (PCE) of 15.07%, outperforming those employing 2BTh-3F (PCE of 9.34%). Moreover, by incorporating 2BTh-CN into the D18:2BTh-C2 system as a third component, we achieve a PCE exceeding 17% in a high-performing ternary OSC, ranking among the most efficient NFREA-based OSCs reported to date. Overall, our study underscores the potential of deliberate design and optimization of non-fused ring acceptor molecular structures to attain outstanding photovoltaic performance.
在本研究中，我们设计并合成了两种非稠环受体（NFREA），即2BTh - 3F和2BTh - CN，引入了不同的取代基以调节它们的吸电子性质。我们精心探究了这些取代基对NFREA性能的不同影响。我们的研究表明，在2BTh - CN中引入3,5 - 二氟 - 4 - 氰基苯基显著增强了吸电子能力和分子内电荷转移，导致吸收光谱红移和能级优化。因此，使用2BTh - CN的有机太阳能电池（OSC）展现出15.07%的显著功率转换效率（PCE），优于使用2BTh - 3F的电池（PCE为9.34%）。此外，通过将2BTh - CN作为第三组分引入D18:2BTh - C2体系，我们在高性能三元OSC中实现了超过17%的PCE，跻身于迄今为止报道的基于NFREA的最高效OSC之列。总体而言，我们的研究强调了通过精心设计和优化非稠环受体分子结构来实现卓越光伏性能的潜力。
