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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

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

Author

  • Sesha Bamini
  • Hynek Němec
  • Karel Zidek
  • Mohamed Abdellah
  • Mohammed J. Al-Marri
  • Pavel Chábera
  • Carlito Ponseca
  • Kaibo Zheng
  • Tönu Pullerits

Summary, in English

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.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2017

Language

English

Pages

6006-6012

Publication/Series

Physical Chemistry Chemical Physics

Volume

19

Issue

8

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1463-9076