Ligand‐Assisted Coupling Manipulation for Efficient and Stable FAPbI3 Colloidal Quantum Dot Solar Cells. (7th December 2022)

• Record Type: Journal Article
• Authors: Zhang, Xuliang; Huang, Hehe; Jin, Lujie; Wen, Chao; Zhao, Qian; Zhao, Chenyu; Guo, Junjun; Cheng, Chen; Wang, Hongshuai; Zhang, Liang; Li, Youyong; Maung Maung, Yin; Yuan, Jianyu; Ma, Wanli
• Is Part Of: Angewandte Chemie. Volume 135:Number 5(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-07
• Subjects: Electronic Coupling -- FAPbI3 -- Ligand -- Perovskite -- Quantum Dot -- Solar Cells; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202214241
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: For emerging perovskite quantum dots (QDs), understanding the surface features and their impact on the materials and devices is becoming increasingly urgent. In this family, hybrid FAPbI3 QDs (FA: formamidium) exhibit higher ambient stability, near‐infrared absorption and sufficient carrier lifetime. However, hybrid QDs suffer from difficulty in modulating surface ligand, which is essential for constructing conductive QD arrays for photovoltaics. Herein, assisted by an ionic liquid formamidine thiocyanate, we report a facile surface reconfiguration methodology to modulate surface and manipulate electronic coupling of FAPbI3 QDs, which is exploited to enhance charge transport for fabricating high‐quality QD arrays and photovoltaic devices. Finally, a record‐high efficiency approaching 15 % is achieved for FAPbI3 QD solar cells, and they retain over 80 % of the initial efficiency after aging in ambient environment (20–30 % humidity, 25 °C) for over 600 h. Abstract : A facile surface reconfiguration methodology (SRM) is reported for the first time as a general approach to tune the coupling between hybrid FAPbI3 perovskite QDs, which is exploited for improved charge transport for fabricating high‐quality QD arrays and PV devices, leading to a record‐high efficiency approaching 15 % for FAPbI3 perovskite QD solar cell.