Premium
Polyelectrolyte‐Doped SnO 2 as a Tunable Electron Transport Layer for High‐Efficiency and Stable Perovskite Solar Cells
Author(s) -
Huang Xiangping,
Du Jianhui,
Guo Xing,
Lin Zhenhua,
Ma Jing,
Su Jie,
Feng Liping,
Zhang Chunfu,
Zhang Jincheng,
Chang Jingjing,
Hao Yue
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900336
Subject(s) - materials science , doping , perovskite (structure) , polyethylenimine , energy conversion efficiency , optoelectronics , electron mobility , layer (electronics) , electron transport chain , electron , nanotechnology , chemical engineering , chemistry , physics , quantum mechanics , engineering , transfection , biochemistry , gene
The charge transport layer is crucial to the performance and stability of the perovskite solar cells (PSCs). Compared with other conventional metal oxide electron transport materials, SnO 2 has a deeper conduction band and higher electron mobility, and can efficiently serve as an electron transport layer to facilitate charge extraction and transfer. Herein, an optimized low‐temperature solution‐processed SnO 2 electron transport layer is achieved by doping polyethylenimine polyelectrolyte into SnO 2 for the first time in the PSCs. It is found that the performance of all aspects of the doped SnO 2 film is improved over that of the pristine SnO 2 film. The better energy level alignment, larger built‐in field, enhanced electron transfer/extraction, and reduced charge recombination all contribute to the improved device performance. Finally, a PSC with a power conversion efficiency of 20.61% is successfully prepared under low temperature below 150 °C. Moreover, the stability of the doped SnO 2 ‐based device is also greatly improved.