Advertisement

Semiconductors

, Volume 52, Issue 4, pp 548–550 | Cite as

Photocharging Dynamics in Colloidal CdS Quantum Dots Visualized by Electron Spin Coherence

  • D. R. Yakovlev
  • D. H. Feng
  • V. V. Pavlov
  • A. V. Rodina
  • E. V. Shornikova
  • J. Mund
  • M. Bayer
XXV International Symposium “Nanostructures: Physics and Technology”, Saint Petersburg, June 26–30, 2017. Spin Related Phenomena In Nanostructures
  • 22 Downloads

Abstract

We use a time-resolved technique with three laser pulses (pump, orientation and probe) to study the photocharging dynamics with picosecond resolution on a long timescale ranging from ps to ms in CdS colloidal quantum dots. The detection is based on measuring the coherent spin dynamics of electrons, allowing us to distinguish the type of carrier in the dot core (electron or hole). We find that although initially negative photocharging happens because of fast hole trapping on surface states, eventually it evolves to positive photocharging due to electron trapping and hole detrapping. The positive photocharging lasts up to hundreds of microseconds at room temperature.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Al. L. Efros and D. J. Nesbitt, Nat. Nanotechnol. 11, 661 (2016).ADSCrossRefGoogle Scholar
  2. 2.
    W. Qin and P. Guyot-Sionnest, ACS Nano 6, 9125 (2012).CrossRefGoogle Scholar
  3. 3.
    M. J. Fernee, P. Tamarat, and B. Lounis, Chem. Soc. Rev. 43, 1311 (2014).CrossRefGoogle Scholar
  4. 4.
    X. Li, D. H. Feng, H. F. Tong, T. Q. Jia, L. Deng, Z. R. Sun, and Z. Z. Xu, J. Phys. Chem. Lett. 5, 4310 (2014).CrossRefGoogle Scholar
  5. 5.
    D. Feng, D. R. Yakovlev, V. V. Pavlov, A. V. Rodina, E. V. Shornikova, J. Mund, and M. Bayer, Nano Lett. 17, 2844 (2017).ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • D. R. Yakovlev
    • 1
    • 2
  • D. H. Feng
    • 1
    • 3
  • V. V. Pavlov
    • 2
  • A. V. Rodina
    • 2
  • E. V. Shornikova
    • 1
    • 4
  • J. Mund
    • 1
  • M. Bayer
    • 1
    • 2
  1. 1.Experimentelle Physik 2Technische Universität DortmundDortmundGermany
  2. 2.Ioffe InstituteRussian Academy of SciencesSt. PetersburgRussia
  3. 3.State Key Laboratory of Precision SpectroscopyEast China Normal UniversityShanghaiChina
  4. 4.Rzhanov Institute of Semiconductor PhysicsSiberian Branch of Russian Academy of SciencesNovosibirskRussia

Personalised recommendations