Kong Tianyu, Wang Rui, Zheng Ding, Yu Junsheng
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, China.
Front Chem. 2021 Jun 25;9:703561. doi: 10.3389/fchem.2021.703561. eCollection 2021.
Recently, tin oxide (SnO) nanoparticles (NPs) have attracted considerable attention as the electron transporting layer (ETL) for organic solar cells (OSCs) due to their superior electrical properties, excellent chemical stability, and compatibility with low-temperature solution fabrication. However, the rough surface of SnO NPs may generate numerous defects, which limits the performance of the OSCs. In this study, we introduce a perylene diimide derivative (PDINO) that could passivate the defects between SnO NP ETL and the active layer. Compared with the power conversion efficiency (PCE) of the pristine SnO ETL-based OSCs (12.7%), the PDINO-modified device delivers a significantly increased PCE of 14.9%. Overall, this novel composite ETL exhibits lowered work function, improved electron mobility, and reduced surface defects, thus increasing charge collection efficiency and restraining defect-caused molecular recombination in the OSC. Overall, this work demonstrates a strategy of utilizing the organic-inorganic hybrid ETL that has the potential to overcome the drawbacks of SnO NPs, thereby developing efficient and stable OSCs.
最近，氧化锡（SnO）纳米颗粒（NPs）作为有机太阳能电池（OSCs）的电子传输层（ETL）受到了广泛关注，因为它们具有优异的电学性能、出色的化学稳定性以及与低温溶液制备工艺的兼容性。然而，SnO NPs的粗糙表面可能会产生大量缺陷，这限制了OSCs的性能。在本研究中，我们引入了一种苝二酰亚胺衍生物（PDINO），它可以钝化SnO NP ETL与活性层之间的缺陷。与基于原始SnO ETL的OSCs的功率转换效率（PCE）（12.7%）相比，经PDINO修饰的器件的PCE显著提高，达到了14.9%。总体而言，这种新型复合ETL具有降低的功函数、提高的电子迁移率和减少的表面缺陷，从而提高了电荷收集效率并抑制了OSC中由缺陷引起的分子复合。总体而言，这项工作展示了一种利用有机-无机混合ETL的策略，该策略有可能克服SnO NPs的缺点，从而开发出高效且稳定的OSCs。
