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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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Publication details

The article was received on 02 Nov 2016, accepted on 26 Jan 2017 and first published on 09 Feb 2017


Article type: Paper
DOI: 10.1039/C6CP07509F
Citation: Phys. Chem. Chem. Phys., 2017,19, 6006-6012
  • Open access: Creative Commons BY license
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    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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