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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

Ethanol-based green-solution processing of alpha-formamidinium lead triiodide perovskite layers

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Title
Ethanol-based green-solution processing of alpha-formamidinium lead triiodide perovskite layers
Author
Yun, Hyun-SungKwon, Hyoung WooPaik, Min JaeHong, SungtakKim, JaehuiNoh, EunseoPark, JaewangLee, YonghuiSeok, Sang Il
Issue Date
2022-09
Publisher
NATURE PORTFOLIO
Citation
NATURE ENERGY, v.7, no.9, pp.828 - 834
Abstract
Manufacturing of perovskite solar cells would benefit from the avoidance of hazardous solvents and multistep processing. Now, Yun et al. report an ethanol-based perovskite precursor solution that does not need an antisolvent step, enabling devices with 25% efficiency. The use of non-toxic or less-toxic solvents in the mass production of solution-processed perovskite solar cells is essential. However, halide perovskites are generally not completely soluble in most non-toxic solvents. Here we report the deposition of dense and uniform alpha-formamidinium lead triiodide (alpha-FAPbI(3)) films using perovskite precursor solutions dissolved in ethanol-based solvent. The process does not require an antisolvent dripping step. The combination of a Lewis base, such as dimethylacetamide (or dimethylsulfoxide), and an alkylammonium chloride (RNH3Cl) in ethanol results in the stable solvation of FAPbI(3). The RNH3Cl added to the FAPbI(3) precursor solution is removed during spin-coating and high-temperature annealing via iodoplumbate complexes, such as PbI2 center dot RNH2 and PbI2 center dot HCl, coordinated with dimethylacetamide (or dimethylsulfoxide). It is possible to form very dense and uniform alpha-FAPbI(3) perovskite films with high crystallinity by combining several types of RNH3Cl. We obtain power conversion efficiencies of 24.3% using a TiO2 electrode, and of 25.1% with a SnO2 electrode.
URI
https://scholarworks.unist.ac.kr/handle/201301/59282
URL
https://www.nature.com/articles/s41560-022-01086-7
DOI
10.1038/s41560-022-01086-7
ISSN
2058-7546
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