Interlayer Modification Using Phenylethylamine Tetrafluoroborate for Highly Effective Perovskite Solar Cells

作者：Sijia Zhu, Jihuai Wu, Weihai Sun, Weichun Pan, Fangfang Cai, Juanmei Liu, Liqiang Chen, Xia Chen, Chunyan Wang, Xiaobin Wang · 发表于：ACS Applied Energy Materials · 年份：2022 · DOI：10.1021/acsaem.1c03160 · 被引用次数：21 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Chalcogenide Semiconductor Thin Films

Although the best research-cell efficiency of perovskite solar cells (PSCs) has exceeded 25%, the industrial application of PSCs is limited by further improvement of performance and stability. Interface engineering is a prospective method to overcome these issues. Here, phenylethylamine tetrafluoroborate (PEABF 4 ) is introduced into the interlayer between the TiO 2 electron transport layer (ETL) and the perovskite layer. The introduction of PEABF 4 effectively passivates the oxygen vacancy via coordination of BF 4 – with Ti and mitigates inherent trap-state density and nonradiative recombination in the devices. Moreover, the modification of PEABF 4 optimizes the energy match between the perovskite layer and the TiO 2 ETL and improves the crystal quality of the perovskite. Consequently, the PEABF 4 -modified PSCs achieve a power conversion efficiency of 21.21%, accompanied with excellent environmental stability, while the pristine device exhibits an efficiency of 19.25%.