Photocharging Dynamics in Colloidal CdS Quantum Dots Visualized by Electron Spin Coherence
- Authors: Yakovlev D.R.1,2, Feng D.H.1,3, Pavlov V.V.2, Rodina A.V.2, Shornikova E.V.1,4, Mund J.1, Bayer M.1,2
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Affiliations:
- Experimentelle Physik 2
- Ioffe Institute
- State Key Laboratory of Precision Spectroscopy
- Rzhanov Institute of Semiconductor Physics
- Issue: Vol 52, No 4 (2018)
- Pages: 548-550
- Section: XXV International Symposium “Nanostructures: Physics and Technology”, Saint Petersburg, June 26–30, 2017. Spin Related Phenomena In Nanostructures
- URL: https://journals.rcsi.science/1063-7826/article/view/202984
- DOI: https://doi.org/10.1134/S1063782618040310
- ID: 202984
Cite item
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.
About the authors
D. R. Yakovlev
Experimentelle Physik 2; Ioffe Institute
Author for correspondence.
Email: dmitri.yakovlev@tu-dortmund.de
Germany, Dortmund, 44227; St. Petersburg, 194021
D. H. Feng
Experimentelle Physik 2; State Key Laboratory of Precision Spectroscopy
Email: dmitri.yakovlev@tu-dortmund.de
Germany, Dortmund, 44227; Shanghai, 200062
V. V. Pavlov
Ioffe Institute
Email: dmitri.yakovlev@tu-dortmund.de
Russian Federation, St. Petersburg, 194021
A. V. Rodina
Ioffe Institute
Email: dmitri.yakovlev@tu-dortmund.de
Russian Federation, St. Petersburg, 194021
E. V. Shornikova
Experimentelle Physik 2; Rzhanov Institute of Semiconductor Physics
Email: dmitri.yakovlev@tu-dortmund.de
Germany, Dortmund, 44227; Novosibirsk, 630090
J. Mund
Experimentelle Physik 2
Email: dmitri.yakovlev@tu-dortmund.de
Germany, Dortmund, 44227
M. Bayer
Experimentelle Physik 2; Ioffe Institute
Email: dmitri.yakovlev@tu-dortmund.de
Germany, Dortmund, 44227; St. Petersburg, 194021