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journal article·2024Open access

Quantum-confined bismuth iodide perovskite nanocrystals in mesoporous matrices

Sarah Dupé, Dongyu Liu, Antik Ghosh, Andrey S. Vasenko, Stéphanie Pouget, Sandrine Schlutig, Mathieu Vidal, Bénédicte Lebeau, Wai Li Ling, Peter Reiss, Oleg V. Prezhdo, Andrey Ryzhikov, Dmitry Aldakov

Nanoscale· Volume 16· Issue 23
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Source abstract

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.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Univ. Grenoble Alpes, CNRS, CEA, INP, IRIG/SyMMES, STEP, 38000 Grenoble, France

International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

Donostia International Physics Center (DIPC), 20018 San Sebastián-Donostia, Euskadi, Spain

Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, SGX, Grenoble, France

Université de Haute-Alsace, CNRS, Institut de Science des Matériaux de Mulhouse (IS2M), UMR 7361, Axe Matériaux à Porosité Contrôlée, F-68100, Mulhouse, France

Université de Strasbourg, F-67000 Strasbourg, France

Univ. Grenoble Alpes, CEA, CNRS, IBS, 38000 Grenoble, France

Department of Chemistry and Department of Physics & Astronomy, University of Southern California, Los Angeles, California 90089, USA

Funding

Commissariat à l'Énergie Atomique et aux Énergies Alternatives · Centre National de la Recherche Scientifique · Agence Nationale de la Recherche · National Science Foundation

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