基于具有改善的热稳定性和空气稳定性的不对称受体的高效无热退火有机太阳能电池。
High-Efficiency Thermal-Annealing-Free Organic Solar Cells Based on an Asymmetric Acceptor with Improved Thermal and Air Stability.
作者信息
Zhang Jinsheng, Han Yufang, Zhang Wenxia, Ge Jinfeng, Xie Lin, Xia Zihao, Song Wei, Yang Daobin, Zhang Xiaoli, Ge Ziyi
机构信息
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
出版信息
ACS Appl Mater Interfaces. 2020 Dec 23;12(51):57271-57280. doi: 10.1021/acsami.0c17423. Epub 2020 Dec 8.
The stability of organic solar cells (OSCs) is an urgent problem for commercialization. In this work, a novel asymmetric molecule TB-4Cl was designed and synthesized. Quantum chemical computations revealed that TB-4Cl has a larger dipole moment of 1.98 Debye than that of Y6, which can induce a stronger intermolecular interaction. Without thermal annealing, devices based on PM6:TB-4Cl achieved a higher efficiency of 14.67%. Impressively, all of the devices showed a negligible difference in power conversion efficiency (PCE) before and after thermal-annealing treatment. Compared to the unencapsulated PM6:Y6-based devices, PM6:TB-4Cl-based devices exhibited improved thermal and air stability, evidenced by retaining around 75% (TB-4Cl) and 60% (Y6) after being heated at 100 °C in nitrogen for 110 h and 65% (TB-4Cl) and 50% (Y6) in air for 92 h. This work indicates that an A-DA'D-A asymmetric molecule can be a promising candidate for achieving stable OSCs with high efficiency.
有机太阳能电池（OSCs）的稳定性是商业化面临的一个紧迫问题。在这项工作中，设计并合成了一种新型不对称分子TB-4Cl。量子化学计算表明，TB-4Cl的偶极矩为1.98德拜，比Y6的偶极矩大，这可以诱导更强的分子间相互作用。在没有热退火的情况下，基于PM6:TB-4Cl的器件实现了14.67%的更高效率。令人印象深刻的是，所有器件在热退火处理前后的功率转换效率（PCE）差异可忽略不计。与未封装的基于PM6:Y6的器件相比，基于PM6:TB-4Cl的器件表现出更好的热稳定性和空气稳定性，在氮气中于100°C加热110小时后，TB-4Cl基器件保留约75%、Y6基器件保留约60%，在空气中加热92小时后，TB-4Cl基器件保留65%、Y6基器件保留50%，证明了这一点。这项工作表明，A-DA'D-A不对称分子有望成为实现高效稳定有机太阳能电池的候选材料。
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