Li Ping, Chen Lijia, Hu Xiaoyan, He Lirong, Jiang Zezhuan, Luo Minghao, Huang Haishen, Yuan Wei, He Yinghu
School of Physics and Electronic Science, Zunyi Normal University, Zunyi 563006, China.
College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
Nanomaterials (Basel). 2021 Dec 22;12(1):15. doi: 10.3390/nano12010015.
Interface modification plays an important role in enhancing the photoelectric conversion efficiency and stability of organic solar cells. In this work, alkali metal lithium chloride (LiCl) was introduced between indium tin oxide and polyethyleneimine ethoxylate (PEIE) to prepare a double-layer electron transport layer. Results show that the introduction of LiCl has dual functions. The first function is that LiCl can enhance conductivity, thereby facilitating charge collection. The second function is that the double-layer electron transport layer based on LiCl can induce the crystallization of active layer, thereby enhancing charge transport. Devices with LiCl/PEIE double layer achieve a high power conversion efficiency (PCE) of 3.84%, which is 21.5% higher than that of pristine devices (the PCE of pristine devices with pure PEIE interface layer is 3.16%).
界面修饰在提高有机太阳能电池的光电转换效率和稳定性方面起着重要作用。在这项工作中，在氧化铟锡和聚乙撑亚胺乙氧基化物（PEIE）之间引入碱金属氯化锂（LiCl）以制备双层电子传输层。结果表明，LiCl的引入具有双重功能。第一个功能是LiCl可以提高导电性，从而促进电荷收集。第二个功能是基于LiCl的双层电子传输层可以诱导活性层结晶，从而增强电荷传输。具有LiCl/PEIE双层的器件实现了3.84%的高功率转换效率（PCE），比原始器件高21.5%（具有纯PEIE界面层的原始器件的PCE为3.16%）。
