Pseudo-halide anion engineering for α-FAPbI3 perovskite solar cells

Jaeki Jeong, Minjin Kim, Jongdeuk Seo, Haizhou Lu, Paramvir Ahlawat, Aditya Mishra, Yingguo Yang, Michael A. Hope, Felix T. Eickemeyer, Maengsuk Kim, Yung Jin Yoon, In Woo Choi, Barbara Primera Darwich, Seung Ju Choi, Yimhyun Jo, Jun Hee Lee, Bright Walker, Shaik M. Zakeeruddin, Lyndon Emsley, Ursula Rothlisberger, Anders Hagfeldt (), Dong Suk Kim (), Michael Grätzel () and Jin Young Kim ()
Additional contact information
Jaeki Jeong: Ulsan National Institute of Science and Technology (UNIST)
Minjin Kim: Korea Institute of Energy Research (KIER)
Jongdeuk Seo: Ulsan National Institute of Science and Technology (UNIST)
Haizhou Lu: École Polytechnique Fédérale de Lausanne (EPFL)
Paramvir Ahlawat: École Polytechnique Fédérale de Lausanne (EPFL)
Aditya Mishra: École Polytechnique Fédérale de Lausanne (EPFL)
Yingguo Yang: Shanghai Advanced Research Institute, Chinese Academy of Sciences
Michael A. Hope: École Polytechnique Fédérale de Lausanne (EPFL)
Felix T. Eickemeyer: École Polytechnique Fédérale de Lausanne (EPFL)
Maengsuk Kim: Ulsan National Institute of Science and Technology (UNIST)
Yung Jin Yoon: Ulsan National Institute of Science and Technology (UNIST)
In Woo Choi: Korea Institute of Energy Research (KIER)
Barbara Primera Darwich: École Polytechnique Fédérale de Lausanne (EPFL)
Seung Ju Choi: Korea Institute of Energy Research (KIER)
Yimhyun Jo: Korea Institute of Energy Research (KIER)
Jun Hee Lee: Ulsan National Institute of Science and Technology (UNIST)
Bright Walker: Kyung Hee University
Shaik M. Zakeeruddin: École Polytechnique Fédérale de Lausanne (EPFL)
Lyndon Emsley: École Polytechnique Fédérale de Lausanne (EPFL)
Ursula Rothlisberger: École Polytechnique Fédérale de Lausanne (EPFL)
Anders Hagfeldt: École Polytechnique Fédérale de Lausanne (EPFL)
Dong Suk Kim: Korea Institute of Energy Research (KIER)
Michael Grätzel: École Polytechnique Fédérale de Lausanne (EPFL)
Jin Young Kim: Ulsan National Institute of Science and Technology (UNIST)

Nature, 2021, vol. 592, issue 7854, 381-385

Abstract: Abstract Metal halide perovskites of the general formula ABX3—where A is a monovalent cation such as caesium, methylammonium or formamidinium; B is divalent lead, tin or germanium; and X is a halide anion—have shown great potential as light harvesters for thin-film photovoltaics1–5. Among a large number of compositions investigated, the cubic α-phase of formamidinium lead triiodide (FAPbI3) has emerged as the most promising semiconductor for highly efficient and stable perovskite solar cells6–9, and maximizing the performance of this material in such devices is of vital importance for the perovskite research community. Here we introduce an anion engineering concept that uses the pseudo-halide anion formate (HCOO−) to suppress anion-vacancy defects that are present at grain boundaries and at the surface of the perovskite films and to augment the crystallinity of the films. The resulting solar cell devices attain a power conversion efficiency of 25.6 per cent (certified 25.2 per cent), have long-term operational stability (450 hours) and show intense electroluminescence with external quantum efficiencies of more than 10 per cent. Our findings provide a direct route to eliminate the most abundant and deleterious lattice defects present in metal halide perovskites, providing a facile access to solution-processable films with improved optoelectronic performance.

Date: 2021
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DOI: 10.1038/s41586-021-03406-5

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