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Issue 8, 2017
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Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

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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.

Graphical abstract: Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

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Article information


Submitted
02 Nov 2016
Accepted
26 Jan 2017
First published
09 Feb 2017

This article is Open Access

Phys. Chem. Chem. Phys., 2017,19, 6006-6012
Article type
Paper

Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

S. B. N., H. Němec, K. Žídek, M. Abdellah, M. J. Al-Marri, P. Chábera, C. Ponseca, K. Zheng and T. Pullerits, Phys. Chem. Chem. Phys., 2017, 19, 6006
DOI: 10.1039/C6CP07509F

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