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Optical ultrafast characterization of copper oxide (CuO) nanocrystal charge-carrier dynamics Hristovski, Ilija; Born, Brandon; Krupa, Jeffrey; Holzman, Jonathan
Abstract
A thorough investigation of copper oxide, specifically cupric oxide (CuO), is performed in the following work with a focus on CuO’s ultrafast free-carrier dynamics and bandstructure. An above-bandgap control beam and below-bandgap signal beam are utilized in transient absorption spectroscopy to gain insight on CuO nanocrystals’ recombination and relaxation dynamics at varying control beam fluences. The authors witnessed three distinct time constants, the first of which changed with control beam fluence between 330 and 630 fs, while the second and third remained constant at 2 ps and 50 ps, respectively. The first time constant is attributed to momentum relaxation from valence band carrier-carrier scattering and exciton-exciton annihilation. The second time constant is attributed to energy relaxation from valence band carrier-phonon scattering. The third time constant is attributed to trapping and recombination as a result of the CuO nanocrystals’ increased trap state density. The findings of this work provide a basis for future research on this emerging CuO nanocrystal system
Item Metadata
| Title |
Optical ultrafast characterization of copper oxide (CuO) nanocrystal charge-carrier dynamics
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| Creator | |
| Contributor | |
| Publisher |
SPIE
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| Date Issued |
2018-02-01
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| Description |
A thorough investigation of copper oxide, specifically cupric oxide (CuO), is performed in the following work with a focus
on CuO’s ultrafast free-carrier dynamics and bandstructure. An above-bandgap control beam and below-bandgap signal
beam are utilized in transient absorption spectroscopy to gain insight on CuO nanocrystals’ recombination and relaxation
dynamics at varying control beam fluences. The authors witnessed three distinct time constants, the first of which changed
with control beam fluence between 330 and 630 fs, while the second and third remained constant at 2 ps and 50 ps,
respectively. The first time constant is attributed to momentum relaxation from valence band carrier-carrier scattering and
exciton-exciton annihilation. The second time constant is attributed to energy relaxation from valence band carrier-phonon
scattering. The third time constant is attributed to trapping and recombination as a result of the CuO nanocrystals’ increased
trap state density. The findings of this work provide a basis for future research on this emerging CuO nanocrystal system
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| Subject | |
| Genre | |
| Type | |
| Language |
eng
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| Date Available |
2021-04-15
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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| DOI |
10.14288/1.0396734
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| URI | |
| Affiliation | |
| Citation |
Ilija R. Hristovski, Brandon Born, Jeffrey D. A. Krupa, Jonathan F. Holzman, "Optical ultrafast characterization of copper oxide (CuO) nanocrystal chargecarrier dynamics," Proc. SPIE 10533, Oxide-based Materials and Devices IX, 1053310 (23 February 2018)
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| Publisher DOI |
10.1117/12.2290491
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| Peer Review Status |
Reviewed
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| Scholarly Level |
Faculty
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| Copyright Holder |
SPIE
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| Rights URI | |
| Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International