Exciton binding energy in CdSe nanoplatelets measured by one- and two-photon absorption
- Author
- Elena V. Shornikova, Dmitri R. Yakovlev, Nikolay A. Gippius, Gang Qiang, Benoit Dubertret, Ali Khan (UGent) , Alessio Di Giacomo (UGent) , Iwan Moreels (UGent) and Manfred Bayer
- Organization
- Project
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- Excitons and Excitonic Complexes in Colloidal Nanocrystals: Impact of Dimensionality, Crystal Structure and Surface (CONEX)
- PHOCONA (Photonics in Flatland: Band Structure Engineering of 2D Excitons in Fluorescent Colloidal Nanomaterials)
- Abstract
- Colloidal semiconductor nanoplatelets exhibit strong quantum confinement for electrons and holes as well as excitons in one dimension, while their in-plane motion is free. Because of the large dielectric contrast between the semiconductor and its ligand environment, the Coulomb interaction between electrons and holes is strongly enhanced. By means of one- and two-photon photoluminescence excitation spectroscopy, we measure the energies of the 1S and 1P exciton states in CdSe nanoplatelets with thicknesses varied from 3 up to 7 monolayers. By comparison with calculations, performed in the effective mass approximation with account of the dielectric enhancement, we evaluate exciton binding energies of 195-315 meV, which is about 20 times greater than that in bulk CdSe. Our calculations of the effective Coulomb potential for very thin nanoplatelets are close to the Rytova-Keldysh model, and the exciton binding energies are comparable with the values reported for monolayer-thick transition metal dichalcogenides.
- Keywords
- Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering, nanoplatelets, CdSe, exciton binding energy, two-photon absorption, SINGLE
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8743152
- MLA
- Shornikova, Elena V., et al. “Exciton Binding Energy in CdSe Nanoplatelets Measured by One- and Two-Photon Absorption.” NANO LETTERS, vol. 21, no. 24, 2021, pp. 10525–31, doi:10.1021/acs.nanolett.1c04159.
- APA
- Shornikova, E. V., Yakovlev, D. R., Gippius, N. A., Qiang, G., Dubertret, B., Khan, A., … Bayer, M. (2021). Exciton binding energy in CdSe nanoplatelets measured by one- and two-photon absorption. NANO LETTERS, 21(24), 10525–10531. https://doi.org/10.1021/acs.nanolett.1c04159
- Chicago author-date
- Shornikova, Elena V., Dmitri R. Yakovlev, Nikolay A. Gippius, Gang Qiang, Benoit Dubertret, Ali Khan, Alessio Di Giacomo, Iwan Moreels, and Manfred Bayer. 2021. “Exciton Binding Energy in CdSe Nanoplatelets Measured by One- and Two-Photon Absorption.” NANO LETTERS 21 (24): 10525–31. https://doi.org/10.1021/acs.nanolett.1c04159.
- Chicago author-date (all authors)
- Shornikova, Elena V., Dmitri R. Yakovlev, Nikolay A. Gippius, Gang Qiang, Benoit Dubertret, Ali Khan, Alessio Di Giacomo, Iwan Moreels, and Manfred Bayer. 2021. “Exciton Binding Energy in CdSe Nanoplatelets Measured by One- and Two-Photon Absorption.” NANO LETTERS 21 (24): 10525–10531. doi:10.1021/acs.nanolett.1c04159.
- Vancouver
- 1.Shornikova EV, Yakovlev DR, Gippius NA, Qiang G, Dubertret B, Khan A, et al. Exciton binding energy in CdSe nanoplatelets measured by one- and two-photon absorption. NANO LETTERS. 2021;21(24):10525–31.
- IEEE
- [1]E. V. Shornikova et al., “Exciton binding energy in CdSe nanoplatelets measured by one- and two-photon absorption,” NANO LETTERS, vol. 21, no. 24, pp. 10525–10531, 2021.
@article{8743152,
abstract = {{Colloidal semiconductor nanoplatelets exhibit strong quantum confinement for electrons and holes as well as excitons in one dimension, while their in-plane motion is free. Because of the large dielectric contrast between the semiconductor and its ligand environment, the Coulomb interaction between electrons and holes is strongly enhanced. By means of one- and two-photon photoluminescence excitation spectroscopy, we measure the energies of the 1S and 1P exciton states in CdSe nanoplatelets with thicknesses varied from 3 up to 7 monolayers. By comparison with calculations, performed in the effective mass approximation with account of the dielectric enhancement, we evaluate exciton binding energies of 195-315 meV, which is about 20 times greater than that in bulk CdSe. Our calculations of the effective Coulomb potential for very thin nanoplatelets are close to the Rytova-Keldysh model, and the exciton binding energies are comparable with the values reported for monolayer-thick transition metal dichalcogenides.}},
author = {{Shornikova, Elena V. and Yakovlev, Dmitri R. and Gippius, Nikolay A. and Qiang, Gang and Dubertret, Benoit and Khan, Ali and Di Giacomo, Alessio and Moreels, Iwan and Bayer, Manfred}},
issn = {{1530-6984}},
journal = {{NANO LETTERS}},
keywords = {{Mechanical Engineering,Condensed Matter Physics,General Materials Science,General Chemistry,Bioengineering,nanoplatelets,CdSe,exciton binding energy,two-photon absorption,SINGLE}},
language = {{eng}},
number = {{24}},
pages = {{10525--10531}},
title = {{Exciton binding energy in CdSe nanoplatelets measured by one- and two-photon absorption}},
url = {{http://doi.org/10.1021/acs.nanolett.1c04159}},
volume = {{21}},
year = {{2021}},
}
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