Interfacial Embedding of Laser‐Manufactured Fluorinated Gold Clusters Enabling Stable Perovskite Solar Cells with Efficiency Over 24

• Published in: Advanced materials (Weinheim) Vol. 33; no. 36; pp. e2101590 - n/a
• Main Authors: Guo, Pengfei, Zhu, Hongfu, Zhao, Wenhao, Liu, Chen, Zhu, Liguo, Ye, Qian, Jia, Ning, Wang, Hongyue, Zhang, Xiuhai, Huang, Wanxia, Vinokurov, Vladimir A., Ivanov, Evgenii, Shchukin, Dmitry, Harvey, Daniel, Ulloa, Jose María, Hierro, Adrian, Wang, Hongqiang
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-09-2021
• Subjects: Additives; Charge transfer; Clusters; Dynamic stability; Embedding; environmental stability; Fluorination; Fluorine; Gold; gold clusters; Grain boundaries; Hydrogen bonding; Hydrophobicity; interfacial loss; Materials science; perovskite solar cells; Perovskites; Phase stability; Photovoltaic cells; pulsed laser irradiation; Relative humidity; Solar cells
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202101590

Tackling the interfacial loss in emerged perovskite‐based solar cells (PSCs) to address synchronously the carrier dynamics and the environmental stability, has been of fundamental and viable importance, while technological hurdles remain in not only creating such interfacial mediator, but the subsequent interfacial embedding in the active layer. This article reports a strategy of interfacial embedding of hydrophobic fluorinated‐gold‐clusters (FGCs) for highly efficient and stable PSCs. The p‐type semiconducting feature enables the FGC efficient interfacial mediator to improve the carrier dynamics by reducing the interfacial carrier transfer barrier and boosting the charge extraction at grain boundaries. The hydrophobic tails of the gold clusters and the hydrogen bonding between fluorine groups and perovskite favor the enhancement of environmental stability. Benefiting from these merits, highly efficient formamidinium lead iodide PSCs (champion efficiency up to 24.02%) with enhanced phase stability under varied relative humidity (RH) from 40% to 95%, as well as highly efficient mixed‐cation PSCs with moisture stability (RH of 75%) over 10 000 h are achieved. It is thus inspiring to advance the development of highly efficient and stable PSCs via interfacial embedding laser‐generated additives for improved charge transfer/extraction and environmental stability.
A hydrophobic p‐type semiconducting additive, fluorinated‐gold‐clusters, is used as a bifunctional interfacial mediator to efficiently modulate the carrier dynamics of perovskite and restrain the perovskite from degradation by external environmental stimuli, which results in an n–i–p perovskite solar cell with a champion efficiency up to 24.02% and moisture stability over 10 000 h in relative humidity of 75%.