"Физика и техника полупроводников"
Вышедшие номера
Photocharging dynamics in colloidal CdS quantum dots visualized by electron spin coherence
Переводная версия: 10.1134/S1063782618040310
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
1Experimentelle Physik 2, Technische Universität Dortmund, Dortmund, Germany
2Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
3State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
4A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
Email: dmitri.yakovlev@tu-dortmund.de
Выставление онлайн: 20 марта 2018 г.

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. Acknowledgements This work has been supported by the Russian Science Foundation (Grant No 14-42-00015).

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