@article{ae3095e8eb344af5b660b7a78cf583d2,
title = "High-performance methylammonium-free ideal-band-gap perovskite solar cells",
abstract = "The development of mixed tin-lead (Sn-Pb)-based perovskite solar cells (PSCs) with low band gap (1.2–1.4 eV) has become critical not only for pushing single-junction devices toward the maximum efficiency given by the Shockley-Queisser limit, but also for enabling all-perovskite tandem devices beyond this limit. However, achieving high power-conversion efficiency (PCE) and long-term device operation stability simultaneously remains a significant challenge for Sn-Pb-based PSCs. Here, we demonstrate near ideal-band-gap (∼1.34 eV) methylammonium-free Sn-Pb-based PSCs with high efficiency (∼20\%) and promising operational stability of maintaining >80\% of initial PCE over 750 h under maximum-power-point tracking. The key to this success is the use of a SnCl2⋅3FACl complex additive that improves the microstructure and reduces the development of residual stress in the Sn-Pb perovskite thin films, which in turn enhances the efficiency and stability of the Sn-Pb-based ideal-band-gap PSCs.",
keywords = "perovskite solar cells, Sn-Pb perovskite, ideal band gap, additives, strain, stability",
author = "Jinhui Tong and Jue Gong and Mingyu Hu and Yadavalli, \{Srinivas K.\} and Zhenghong Dai and Fei Zhang and Chuanxiao Xiao and Ji Hao and Mengjin Yang and Anderson, \{Michael A.\} and Ratcliff, \{Erin L.\} and Berry, \{Joseph J.\} and Padture, \{Nitin P.\} and Yuanyuan Zhou and Kai Zhu",
note = "Funding Information: The work at Brown University was funded by the Office of Naval Research (grants N00014-17-1-2232 and N00014-20-1-2574 ) and National Science Foundation (grants OIA-1538893 and OIA-1929019 ). The work at NREL was supported by the US Department of Energy ( DOE ) under Contract No. DE-AC36-08GO28308 with Alliance for Sustainable Energy, LLC, the Manager and Operator of NREL, and the De-risking Halide Perovskite Solar Cells program of the National Center for Photovoltaics, funded by the US DOE, Office of Energy Efficiency and Renewable Energy , and Solar Energy Technologies Office . J.J.B. acknowledges the support of the Office of Naval Research (ONR). This research used resources of the Advanced Photon Source and Center for Nanoscale Materials, both US DOE Office of Science User Facilities operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. M.A.A. and E.L.R. acknowledge the ONR (Award N00014-20-1-2440) for support of the XPS study. ",
year = "2021",
month = apr,
day = "7",
doi = "10.1016/j.matt.2021.01.003",
language = "English",
volume = "4",
pages = "1365--1376",
journal = "Matter",
issn = "2590-2393",
publisher = "Cell Press",
number = "4",
}
