Stabilization of formamidinium lead triiodide α-phase with isopropylammonium chloride for perovskite solar cells

Byung-wook Park, Hyoung Woo Kwon, Yonghui Lee, Do Yoon Lee, Min Gyu Kim, Geonhwa Kim, Ki-jeong Kim, Young Ki Kim, Jino Im, Tae Joo Shin () and Sang Il Seok ()
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Byung-wook Park: Ulsan National Institute of Science and Technology (UNIST)
Hyoung Woo Kwon: Ulsan National Institute of Science and Technology (UNIST)
Yonghui Lee: Ulsan National Institute of Science and Technology (UNIST)
Do Yoon Lee: Ulsan National Institute of Science and Technology (UNIST)
Min Gyu Kim: Pohang University of Science and Technology (POSTECH)
Geonhwa Kim: Pohang University of Science and Technology (POSTECH)
Ki-jeong Kim: Pohang University of Science and Technology (POSTECH)
Young Ki Kim: Ulsan National Institute of Science and Technology (UNIST)
Jino Im: Korea Research Institute of Chemical Technology
Tae Joo Shin: Ulsan National Institute of Science and Technology (UNIST)
Sang Il Seok: Ulsan National Institute of Science and Technology (UNIST)

Nature Energy, 2021, vol. 6, issue 4, 419-428

Abstract: Abstract Formamidinium lead triiodide (FAPbI3) perovskite solar cells (PSCs) are mainly fabricated by sequentially coating lead iodide and formamidinium iodide, or by coating a solution in which all components are dissolved in one solvent (one-pot process). The PSCs produced by both processes exhibited similar efficiencies; however, their long-term stabilities were notably different. We concluded that the major reason for this behaviour is the stabilization of the α-FAPbI3 phase by isopropylammonium cations produced by the chemical reaction between isopropyl alcohol, used as solvent, and methylammonium chloride, added during the process. On this basis, we fabricated PSCs by adding isopropylammonium chloride to the perovskite precursor solution for the one-pot process and achieved a certified power conversion efficiency of 23.9%. Long-term operational current density–voltage measurements (one sweep every 84 min under 1-Sun irradiation in nitrogen atmosphere) showed that the as-fabricated device with an initial efficiency of approximately 20% recorded an efficiency of about 23% after 1,000 h that gradually degraded to about 22% after an additional 1,000 h.

Date: 2021
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DOI: 10.1038/s41560-021-00802-z

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