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. 2023 Dec 13;13(24):3134. doi: 10.3390/nano13243134

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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PL spectra of the perovskite CsPbBr₃ samples. (a) The PL spectra mapping of sample S5. (b) The peak energy of PL dependent on sample temperature. (c) The FWHM of PL spectra dependent on sample temperature. (d) The relationship of $E_{g 0}$ with a ratio of Cs/Pb in precursors. (e) The relationship of electron–phonon coupling with the concentration of Cs⁺ cations in precursors.