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Optical Characterization of Cesium Lead Bromide Perovskites
Optical Characterization of Cesium Lead Bromide Perovskites
- Source :
- Crystals, Vol 9, Iss 6, p 280 (2019), Crystals (Basel) 9 (2019). doi:10.3390/cryst9060280, info:cnr-pdr/source/autori:Fabio De Matteis, Francesco Vitale, Simone Privitera, Erica Ciotta, Roberto Pizzoferrato, Amanda Generosi, Barbara Paci, Lorenzo Di Mario, Jacopo Stefano Pelli Cresi, Faustino Martelli and Paolo Prosposito/titolo:Optical Characterization of Cesium Lead Bromide Perovskites/doi:10.3390%2Fcryst9060280/rivista:Crystals (Basel)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume:9, Crystals, Volume 9, Issue 6
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- CsPbBr3 and Cs4PbBr6 perovskite powders have been synthesized through a relatively simple low-temperature and low-cost method. Nanocrystalline films have also been deposited from solutions with four different molar compositions of binary salt precursors. Optical absorption, emission and excitation spectra have been performed in the UV-visible spectral range while X-ray diffraction (XRD) has been recorded to characterize the nanocrystal morphology for the different molar compositions. A preferential orientation of crystallites along the (024) crystalline plane has been observed as a function of the different deposition conditions in films growth. All the crystals show an absorption edge around 530 nm<br />Tauc plots of the absorption returned bandgaps ranging from 2.29 to 2.35 eV characteristic of CsPbBr3 phase. We attribute the UV absorption band peaked at 324 nm to the fundamental band-to-band transition for Cs4PbBr6. It was observed that the samples with the most ordered Cs4PbBr6 crystals exhibited the most intense emission of light, with a bright green emission at 520 nm, which are however due to the luminescence of the inclusion of CsPbBr3 nanoclusters into the Cs4PbBr6. The latter shows instead an intense UV emission. Differently, the pure CsPbBr3 powder did not show any intense fluorescent emission. The excitation spectra of the green fluorescent emission in all samples closely resemble the CsPbBr3 absorption with the peculiar dip around 324 nm as expected from density of state calculations reported in the literature.
- Subjects :
- Materials science
Cs4PbBr6
General Chemical Engineering
Analytical chemistry
02 engineering and technology
010402 general chemistry
01 natural sciences
Settore FIS/03 - Fisica della Materia
Nanoclusters
Inorganic Chemistry
nanocrystals
lcsh:QD901-999
General Materials Science
cesium lead bromide perovskites
fluorescence
Absorption (electromagnetic radiation)
Perovskite (structure)
Settore FIS/01 - Fisica Sperimentale
021001 nanoscience & nanotechnology
Condensed Matter Physics
Nanocrystalline material
0104 chemical sciences
Settore ING-IND/23 - Chimica Fisica Applicata
Nanocrystal
Absorption edge
lcsh:Crystallography
Crystallite
0210 nano-technology
Luminescence
Subjects
Details
- ISSN :
- 20734352
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Crystals
- Accession number :
- edsair.doi.dedup.....a995d53e6cfa47be9127dd90acad493b
- Full Text :
- https://doi.org/10.3390/cryst9060280