Phonon Coupling with Excitons and Free Carriers in Formamidinium Lead Bromide Perovskite Nanocrystals
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b0265af1-7132-425d-a92d-cfdb2900a31d
- author
- 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
- organization
- publishing date
- 2018-08-02
- 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}}, }