Issue 23, 2024

Quantum-confined bismuth iodide perovskite nanocrystals in mesoporous matrices

Abstract

Bismuth iodide perovskite nanocrystals are considered a viable alternative to the Pb halide ones due to their reduced toxicity and increased stability. However, it is still challenging to fabricate nanocrystals with a small and controlled size, and their electronic properties are not well understood. Here, we propose the growth of Bi iodide perovskite nanocrystals using different mesoporous silica with ordered pores of controlled diameter as templates. We obtain a series of confined Cs3Bi2I9 and MA3Bi2I9 perovskites with diameters of 2.3, 3.7, 7.4, and 9.2 nm, and precise size control. The complex absorption spectra of the encapsulated perovskites cannot be properly fitted using classical Tauc or Elliott formalisms. By fitting the spectra with a modified Elliott formula, the bandgap values and exciton binding energies (70–400 meV) could be extracted. The calculated bandgaps scale with the pore sizes. Using a combined experimental and theoretical approach, we demonstrate for the first time quantum confinement in 0D Bi-iodide perovskite nanocrystals.

Graphical abstract: Quantum-confined bismuth iodide perovskite nanocrystals in mesoporous matrices

Supplementary files

Article information

Article type
Paper
Submitted
29 Jan 2024
Accepted
02 May 2024
First published
16 May 2024
This article is Open Access
Creative Commons BY license

Nanoscale, 2024,16, 11223-11231

Quantum-confined bismuth iodide perovskite nanocrystals in mesoporous matrices

S. Dupé, D. Liu, A. Ghosh, A. S. Vasenko, S. Pouget, S. Schlutig, M. Vidal, B. Lebeau, W. L. Ling, P. Reiss, O. V. Prezhdo, A. Ryzhikov and D. Aldakov, Nanoscale, 2024, 16, 11223 DOI: 10.1039/D4NR00430B

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