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Phonon Coupling with Excitons and Free Carriers in Formamidinium Lead Bromide Perovskite Nanocrystals

Ghosh, Supriya LU ; Shi, Qi LU ; Pradhan, Bapi ; Kumar, Pushpendra LU ; Wang, Zhengjun LU ; Acharya, Somobrata ; Pal, Suman Kalyan ; Pullerits, Tõnu LU and Karki, Khadga J. LU (2018) In The Journal of Physical Chemistry Letters 9(15). p.4245-4250
Abstract
Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique optoelectronic and photoluminescence (PL) properties. Here, we examine the phase composition and the temperature dependence of emission line width broadening in formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (NCs) for light-emitting applications and identify different charge-carrier scattering mechanisms. Our results show most of the emission is from the orthorhombic phase. The PL line width broadening at high temperature is dominated by the Fröhlich interaction between the free charge carriers and the optical phonons. At low temperatures, the peak of the PL spectrum exhibits a continuous red shift indicating... (More)
Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique optoelectronic and photoluminescence (PL) properties. Here, we examine the phase composition and the temperature dependence of emission line width broadening in formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (NCs) for light-emitting applications and identify different charge-carrier scattering mechanisms. Our results show most of the emission is from the orthorhombic phase. The PL line width broadening at high temperature is dominated by the Fröhlich interaction between the free charge carriers and the optical phonons. At low temperatures, the peak of the PL spectrum exhibits a continuous red shift indicating an increase of excitons contribution at lower temperatures, and concurrently the line width also narrows down due to the inhibition of the optical phonons. From the temperature-dependent measurements, the coupling strength of both the charge phonon interaction and the exciton phonon interaction have been determined. The obtained results indicate that the charge phonon coupling strengths are higher compared to the exciton phonon coupling. (Less)
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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
9
issue
15
pages
4245 - 4250
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:29996055
  • scopus:85049904301
ISSN
1948-7185
DOI
10.1021/acs.jpclett.8b01729
language
English
LU publication?
yes
id
b0265af1-7132-425d-a92d-cfdb2900a31d
date added to LUP
2018-08-15 17:21:33
date last changed
2023-11-17 22:45:12
@article{b0265af1-7132-425d-a92d-cfdb2900a31d,
  abstract     = {{Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique optoelectronic and photoluminescence (PL) properties. Here, we examine the phase composition and the temperature dependence of emission line width broadening in formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (NCs) for light-emitting applications and identify different charge-carrier scattering mechanisms. Our results show most of the emission is from the orthorhombic phase. The PL line width broadening at high temperature is dominated by the Fröhlich interaction between the free charge carriers and the optical phonons. At low temperatures, the peak of the PL spectrum exhibits a continuous red shift indicating an increase of excitons contribution at lower temperatures, and concurrently the line width also narrows down due to the inhibition of the optical phonons. From the temperature-dependent measurements, the coupling strength of both the charge phonon interaction and the exciton phonon interaction have been determined. The obtained results indicate that the charge phonon coupling strengths are higher compared to the exciton phonon coupling.}},
  author       = {{Ghosh, Supriya and Shi, Qi and Pradhan, Bapi and Kumar, Pushpendra and Wang, Zhengjun and Acharya, Somobrata and Pal, Suman Kalyan and Pullerits, Tõnu and Karki, Khadga J.}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{15}},
  pages        = {{4245--4250}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The Journal of Physical Chemistry Letters}},
  title        = {{Phonon Coupling with Excitons and Free Carriers in Formamidinium Lead Bromide Perovskite Nanocrystals}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.8b01729}},
  doi          = {{10.1021/acs.jpclett.8b01729}},
  volume       = {{9}},
  year         = {{2018}},
}