Dong Jiale, Guo Jian, Wang Xiaoliang, Dong Peng, Wang Zhongqiang, Zhou Yingjuan, Miao Yanqin, Zhao Bo, Hao Yuying, Wang Hua, Xu Bingshe, Yin Shougen
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China.
Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
ACS Appl Mater Interfaces. 2020 Oct 14;12(41):46373-46380. doi: 10.1021/acsami.0c12845. Epub 2020 Sep 30.
The hole transporting layers (HTLs) between the electrode and light absorber play a vital role in charge extraction and transport processes in organic solar cells (OSCs). Herein, a bilayer structure HTL of CuSCN/TFB is formed by soluble copper(I) thiocyanate (CuSCN) and poly[(9,9-dioctylfluorenyl-2,7-diyl)--(4,4'-(-(4-butylphenyl)))] (TFB). The excellent charge extraction capability is proved in nonfullerene PM6:Y6 and fullerene PTB7-Th:PCBM blend system-based cells. The introduction of TFB tunes the work function and polishes the interfacial contact between the HTL and light absorber, which favors the hole extraction process in cells. Meanwhile, lower recombination loss, higher exciton dissociation probability, and larger domain size are observed in CuSCN/TFB HTL-based cells compared to those of the reference cell with the pristine CuSCN HTL, which significantly improve the photovoltaic performance. As a result, a champion efficiency of 15.10% is obtained, which is >14% higher than the efficiency of 13.15% obtained in the reference cell. This study suggests that CuSCN/TFB is a promising HTL to achieve high efficiency for OSCs.
电极与光吸收体之间的空穴传输层（HTLs）在有机太阳能电池（OSCs）的电荷提取和传输过程中起着至关重要的作用。在此，由可溶性硫氰酸铜（I）（CuSCN）和聚[（9,9 - 二辛基芴基 - 2,7 - 二基） - （4,4'-（-（4 - 丁基苯基）））]（TFB）形成了CuSCN/TFB双层结构的空穴传输层。在基于非富勒烯PM6:Y6和富勒烯PTB7 - Th:PCBM共混体系的电池中证明了其优异的电荷提取能力。TFB的引入调节了功函数并改善了空穴传输层与光吸收体之间的界面接触，这有利于电池中的空穴提取过程。同时，与具有原始CuSCN空穴传输层的参考电池相比，在基于CuSCN/TFB空穴传输层的电池中观察到更低的复合损失、更高的激子解离概率和更大的域尺寸，这显著提高了光伏性能。结果，获得了15.10%的最佳效率，比参考电池中获得的13.15%的效率高出>14%。这项研究表明，CuSCN/TFB是一种有前途的空穴传输层，可实现有机太阳能电池的高效率。
