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What are Methylammonium and Solvent Fates upon Halide Perovskite Thin‐Film Preparation and Thermal Aging?

Abstract : The recent remarkable achievements in terms of efficiency performance and stability of hybrid organic-inorganic perovskite solar cells (PSCs) have been notably obtained by optimizing the A-site cation composition of formamidinium-based 3D perovskites. As methylammonium chloride is ubiquitously employed in precursor solution for very high efficiency formamidinium-based PSC, the purpose of the present paper is to unveil the exact role of methylammonium (MA +), chloride and solvent on the film growth and their fate upon the layer thermal annealing process. Methylammonium is shown to react with formamidinium to form two methyl compounds while its excess is eliminated along with chloride. The final perovskite layer A-sites are mainly occupied by formamidinium, whereas MA + content is only 2-3 mol%, and below 3-N-Methyl formamidinium one. 1-N-Methyl formamidinium is detected as traces. Meanwhile, the solvent is homogeneously eliminated throughout the layer thickness. Upon thermal aging stress, the layer is degraded from its top with the formation of PbI2. MA + is rapidly fully eliminated while the stable methyl formamidinium compounds remain in the perovskite layer.
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https://hal-cnrs.archives-ouvertes.fr/hal-03807877
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Submitted on : Monday, October 10, 2022 - 11:05:17 AM
Last modification on : Tuesday, October 11, 2022 - 4:08:11 AM

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Daming Zheng, Fei Chen, Marie‐noelle Rager, Liam Gollino, Boxue Zhang, et al.. What are Methylammonium and Solvent Fates upon Halide Perovskite Thin‐Film Preparation and Thermal Aging?. Advanced Materials Interfaces, In press, pp.2201436. ⟨10.1002/admi.202201436⟩. ⟨hal-03807877⟩

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