Affiliation:
1. Institute for Microelectronics and Microsystems (IMM) National Research Council (CNR) Strada VIII n.5 Zona Industriale Catania 95121 Italy
2. Faculty of Chemistry Materials Research Centre Brno University of Technology Purkynova 118 Brno 612 00 Czech Republic
3. Central European Institute of Technology (CEITEC) Brno University of Technology Purkynova 656/123 Brno 612 00 Czech Republic
Abstract
AbstractIn this study, the optical behavior of lead‐free Bi‐based low‐dimensional perovskite single crystals (Cs3Bi2Cl9, Cs3Bi2Br9, Cs3Bi2I9, and MA3Bi2I9) is investigated by spectroscopic ellipsometry, supported by X‐ray diffraction and density functional theory calculations. All materials exhibit a strong excitonic peak resulting from photogenerated electron–hole Coulomb interactions, whereas the threshold of continuous absorption is found at higher energies. The resonances of the excitonic and continuous bands, along with exciton binding energies, are extracted through Critical Point Analysis of the ellipsometric data over a wide temperature range (from −90 °C to 90 °C), revealing subtle variations in the optical characteristics for each single crystal. These materials can be applied in optoelectronics as photodetectors because of their high stability and lower toxicity compared to their Pb‐based perovskites.
Funder
Ministero dell'Università e della Ricerca
Jihomoravské centrum pro mezinárodní mobilitu
Vysoké Učení Technické v Brně
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
6 articles.
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