Zhou Dan, Yang Fei, Qin Yuancheng, Zhong Rong, Xu Haitao, Tong Yongfen, Zhang Yubao, Zhang Qin, Li Mingjun, Xie Yu
Key Laboratory of Jiangxi Province for Persistent Pollutants, Control and Resources Recycle, Nanchang Hangkong University, 696 Fenghe South Avenue, Nanchang 330063, China.
College of Materials Science and Engineering, Nanchang Hangkong University, 696 Fenghe Avenue, Nanchang 330063, China.
Polymers (Basel). 2019 Apr 10;11(4):655. doi: 10.3390/polym11040655.
The electron transport layer (ETL) is very crucial for enhancing the device performance of polymer solar cells (PSCs). Meanwhile, thickness-insensitive and environment-friendly water/alcohol soluble processing are two essential requirements for large-scale roll-to-roll commercial application. Based on this, we designed and synthesized two new n-type ETLs with tetraethylene pentamine or butyl sulfonate sodium substituted tetraethylene pentamine as the branched side chains and high electron affinities perylene diimide (PDI) as the central core, named as and . Encouragingly, both and can effectively reduce the interfacial barrier and improve the interfacial contact. In addition, both of them can exhibit strong n-type self-doping effects, especially the with higher density of negative charge. Consequently, compared to bare ITO, the PCE of the devices with ITO/ and ITO/ ETLs has increased to 3-4 times. Our research results indicate that n-type self-doping PDI-based ETL and could be promising candidates for ETL in environment-friendly water/alcohol soluble processing large-scale PSCs.
电子传输层（ETL）对于提高聚合物太阳能电池（PSC）的器件性能至关重要。同时，对厚度不敏感且环境友好的水/醇溶性加工是大规模卷对卷商业应用的两个基本要求。基于此，我们设计并合成了两种新型n型ETL，它们以四乙烯五胺或丁磺酸钠取代的四乙烯五胺作为支链侧链，以具有高电子亲和力的苝二酰亚胺（PDI）作为中心核，分别命名为 和 。令人鼓舞的是， 和 都能有效降低界面势垒并改善界面接触。此外，它们都能表现出很强的n型自掺杂效应，尤其是带负电荷密度更高的 。因此，与裸ITO相比，采用ITO/ 和ITO/ ETL的器件的光电转换效率（PCE）提高到了3至4倍。我们的研究结果表明，基于n型自掺杂PDI 的ETL 和 有望成为环境友好的水/醇溶性加工大规模PSC中ETL的候选材料。
