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Ethanol-based green-solution processing of α-formamidinium lead triiodide perovskite layers
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Ethanol-based green-solution processing of α-formamidinium lead triiodide perovskite layers
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Journal Article
Ethanol-based green-solution processing of α-formamidinium lead triiodide perovskite layers
2022
Overview
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 α-formamidinium lead triiodide (α-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 (RNH
3
Cl) in ethanol results in the stable solvation of FAPbI
3
. The RNH
3
Cl added to the FAPbI
3
precursor solution is removed during spin-coating and high-temperature annealing via iodoplumbate complexes, such as PbI
2
·RNH
2
and PbI
2
·HCl, coordinated with dimethylacetamide (or dimethylsulfoxide). It is possible to form very dense and uniform α-FAPbI
3
perovskite films with high crystallinity by combining several types of RNH
3
Cl. We obtain power conversion efficiencies of 24.3% using a TiO
2
electrode, and of 25.1% with a SnO
2
electrode.
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.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
