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. 2021 Jun 28;12:3995. doi: 10.1038/s41467-021-24258-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Normalized transient absorption spectra measured at an excitation wavelength of (a, c) 330 nm for the (3AMP)PbI₄ film and (b, d) 316 nm for the (4AMP)PbI₄ film with a pump fluence of 2.0 μJ/cm² and 4.0 μJ/cm². Extracted hot-carrier temperatures as a function of delay time for (e) (3AMP)PbI₄ and (f) (4AMP)PbI₄ at different pump fluences (2.0 μJ/cm² and 4.0 μJ/cm²). The hot carrier temperatures of (PMA)₂PbI₄ and (PEA)₂PbI₄ are shown with gray and purple circles for comparison. The solid lines represent fits to a biexponential decay function.