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Exciton Binding Energy and the Origin of Yellow-Light Emission in CH3NH3PbBr3 Single Crystals Full article

Journal Physical Review Materials
, E-ISSN: 2475-9953
Output data Year: 2024, Volume: 8, Number: 3, Article number : 034601, Pages count : 9 DOI: 10.1103/physrevmaterials.8.034601
Tags METHYLAMMONIUM LEAD BROMIDE; HALIDE PEROVSKITES; EFFECTIVE MASSES; BAND; PHOTOLUMINESCENCE; DEPENDENCE; BR
Authors Zhevstovskikh I.V. 1,2 , Averkiev N.S. 3 , Sarychev M.N. 2 , Semenova O.I. 4 , Tereshchenko O.E. 4
Affiliations
1 M.N. Miheev Institute of Metal Physics of Ural Branch of RAS, Ekaterinburg 620137, Russia
2 Ural Federal University, Ekaterinburg 620002, Russia
3 Ioffe Institute, St. Petersburg 194021, Russia
4 A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia

Abstract: Organic-inorganic lead halide perovskites have emerged in recent years as semiconductor materials for various optoelectronic and photovoltaic applications. The exciton binding energy is an important parameter because the formation of excitons can potentially hamper charge separation in solar cells. However, it remains a challenge to experimentally determine the exciton binding energy in hybrid bromine-based perovskites: the obtained values have a tens meV spread. Here we present in detail the near-band edge photoluminescence study in CH3⁢NH3⁢PbBr3 single crystals under different photoluminescence excitation densities with a 405 nm laser diode. We show that by using high laser excitation intensities it is possible to make a direct measurement of the exciton binding energy, which we find to be only 12 meV at low temperatures, lower than has been previously determined. In the low temperature orthorhombic phase, besides the free exciton emission at 2.25 eV, we observed the broad yellow-light emission at 2.16 eV, which exhibited a red shift with the increasing temperature and a blue shift with increasing laser excitation intensity. Based on the excitation power density and temperature dependence of the photoluminescence spectra, we interpreted yellow-light emission as a recombination of bound excitons and a donor-acceptor pair transition. The results obtained are essential for a better understanding of the electronic properties of these materials and provide a guideline for their further applications with improved performance.
Cite: Zhevstovskikh I.V. , Averkiev N.S. , Sarychev M.N. , Semenova O.I. , Tereshchenko O.E.
Exciton Binding Energy and the Origin of Yellow-Light Emission in CH3NH3PbBr3 Single Crystals
Physical Review Materials. 2024. V.8. N3. 034601 :1-9. DOI: 10.1103/physrevmaterials.8.034601 WOS Scopus OpenAlex
Dates:
Submitted: Sep 14, 2023
Accepted: Mar 1, 2024
Published print: Mar 18, 2024
Identifiers:
Web of science: WOS:001195804800005
Scopus: 2-s2.0-85188187646
OpenAlex: W4392911261
Citing:
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