title: Reducing Hysteresis and Enhancing Performance of Perovskite Solar Cells Using Low-Temperature Processed Y-Doped SnO2Nanosheets as Electron Selective Layers.
abstract: Despite the rapid increase of efficiency, perovskite solar cells (PSCs) still face some challenges, one of which is the current-voltage hysteresis. Herein, it is reported that yttrium-doped tin dioxide (Y-SnO2) electron selective layer (ESL) synthesized by an in situ hydrothermal growth process at 95 °C can significantly reduce the hysteresis and improve the performance of PSCs. Comparison studies reveal two main effects of Y doping of SnO2ESLs: (1) it promotes the formation of well-aligned and more homogeneous distribution of SnO2nanosheet arrays (NSAs), which allows better perovskite infiltration, better contacts of perovskite with SnO2nanosheets, and improves electron transfer from perovskite to ESL; (2) it enlarges the band gap and upshifts the band energy levels, resulting in better energy level alignment with perovskite and reduced charge recombination at NSA/perovskite interfaces. As a result, PSCs using Y-SnO2NSA ESLs exhibit much less hysteresis and better performance compared with the cells using pristine SnO2NSA ESLs. The champion cell using Y-SnO2NSA ESL achieves a photovoltaic conversion efficiency of 17.29% (16.97%) when measured under reverse (forward) voltage scanning and a steady-state efficiency of 16.25%. The results suggest that low-temperature hydrothermal-synthesized Y-SnO2NSA is a promising ESL for fabricating efficient and hysteresis-less PSC.
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Guang
authors.initials: G
authors.lastname: Yang
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Lei
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Hong
authors.initials: H
authors.lastname: Tao
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Xiaolu
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Ma
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.|Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, OH, 43606, USA.
authors.forename: Weijun
authors.initials: W
authors.lastname: Ke
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Liangbin
authors.initials: L
authors.lastname: Xiong
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Pingli
authors.initials: P
authors.lastname: Qin
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.|Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, 999077, P. R. China.
authors.forename: Minchao
authors.initials: M
authors.lastname: Qin
authors.affiliation: Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, 999077, P. R. China.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Lu
authors.affiliation: Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, OH, 43606, USA.
authors.forename: Yanfa
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
authors.forename: Guojia
authors.initials: G
authors.lastname: Fang
keywords: Y-doped SnO2 nanosheets; electron selective layer; hysteresis; low temperature; perovskite solar cells