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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems (LEHMS)
Research Interests
  • Solar energy conversion, perovskite solar cells, inorganic-organic hybrid materials and processing, solution chemistry

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

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Title
Stabilization of formamidinium lead triiodide alpha-phase with isopropylammonium chloride for perovskite solar cells
Author
Park, Byung-wookKwon, Hyoung WooLee, YonghuiLee, Do YoonKim, Min GyuKim, GeonhwaKim, Ki-jeongKim, Young KiIm, JinoShin, Tae JooSeok, Sang Il
Issue Date
2021-04
Publisher
NATURE RESEARCH
Citation
NATURE ENERGY
Abstract
The operational stability of formamidinium lead triiodide solar cells varies with the fabrication method of the perovskite layer. Now Park et al. find that isopropylammonium stabilizes the perovskite structure and leads to solar cells with 2,000-h stability under constant illumination. Formamidinium lead triiodide (FAPbI(3)) 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 alpha-FAPbI(3) 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/52783
URL
https://www.nature.com/articles/s41560-021-00802-z
DOI
10.1038/s41560-021-00802-z
ISSN
2058-7546
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