Excitonic Enhancement and Excited Excitonic States in CsPbBr[sub.3] Halide Perovskite Single Crystals

Halide perovskites are novel photonics materials promising numerous applications in fields such as photovoltaics, LED light sources, microlasers, and radiation detectors. Many halide perovskites are direct-gap semiconductors, and Wannier–Mott excitons play a significant role in their optical propert...

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Bibliographic Details
Published inMaterials Vol. 16; no. 1
Main Authors Samsonova, Anna Yu, Yudin, Vsevolod I, Shurukhina, Anna V, Kapitonov, Yury V
Format Journal Article
LanguageEnglish
Published MDPI AG 01.12.2022
Subjects
Crystals
Electric properties
Exciton theory
Materials research
Metal halides
Optical properties
Perovskite
Russia
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ISSN1996-1944
1996-1944
DOI10.3390/ma16010185

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Summary:Halide perovskites are novel photonics materials promising numerous applications in fields such as photovoltaics, LED light sources, microlasers, and radiation detectors. Many halide perovskites are direct-gap semiconductors, and Wannier–Mott excitons play a significant role in their optical properties near the fundamental absorption edge. The high oscillator strength of these states favors applications where efficient interaction with light is required. In this work, to study excitonic states in CsPbBr[sub.3] halide perovskite single crystals, the reflection spectroscopy at temperatures from 4 K was used. A reflection coefficient up to 70% was observed for the n=1 exciton state, followed by weak excited states of excitons with n=2 and n=3. It should be noted that the Sommerfeld enhancement factor should be considered for a correct description of the behavior of the dielectric constant, taking into account excitonic effects.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16010185