Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO
(2017) In Physical Chemistry Chemical Physics 19(8). p.6006-6012- Abstract
Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra shows that electron injection occurs in a two-step process, where the formation of a charge transfer state (occurring in several picoseconds) is followed by its dissociation within tens of picoseconds. The photoconductivity of electrons injected into the ZnO nanoparticles is lower than that of charges photogenerated directly in ZnO. We conclude that the motion of injected electrons in ZnO nanoparticles is strongly influenced by their interaction with positive charges left in the sensitizing quantum dots.
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https://lup.lub.lu.se/record/2c383447-7ded-4871-be20-0915b73a39f5
- author
- Bamini, Sesha ; Němec, Hynek ; Zidek, Karel LU ; Abdellah, Mohamed LU ; Al-Marri, Mohammed J. ; Chábera, Pavel LU ; Ponseca, Carlito LU ; Zheng, Kaibo LU and Pullerits, Tönu LU
- organization
- publishing date
- 2017
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Chemistry Chemical Physics
- volume
- 19
- issue
- 8
- pages
- 7 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:28182179
- wos:000395869500034
- scopus:85015070944
- ISSN
- 1463-9076
- DOI
- 10.1039/c6cp07509f
- language
- English
- LU publication?
- yes
- id
- 2c383447-7ded-4871-be20-0915b73a39f5
- date added to LUP
- 2017-03-23 12:09:45
- date last changed
- 2025-01-07 10:16:25
@article{2c383447-7ded-4871-be20-0915b73a39f5, abstract = {{<p>Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra shows that electron injection occurs in a two-step process, where the formation of a charge transfer state (occurring in several picoseconds) is followed by its dissociation within tens of picoseconds. The photoconductivity of electrons injected into the ZnO nanoparticles is lower than that of charges photogenerated directly in ZnO. We conclude that the motion of injected electrons in ZnO nanoparticles is strongly influenced by their interaction with positive charges left in the sensitizing quantum dots.</p>}}, author = {{Bamini, Sesha and Němec, Hynek and Zidek, Karel and Abdellah, Mohamed and Al-Marri, Mohammed J. and Chábera, Pavel and Ponseca, Carlito and Zheng, Kaibo and Pullerits, Tönu}}, issn = {{1463-9076}}, language = {{eng}}, number = {{8}}, pages = {{6006--6012}}, publisher = {{Royal Society of Chemistry}}, series = {{Physical Chemistry Chemical Physics}}, title = {{Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO}}, url = {{http://dx.doi.org/10.1039/c6cp07509f}}, doi = {{10.1039/c6cp07509f}}, volume = {{19}}, year = {{2017}}, }