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Semiconductors

, Volume 52, Issue 5, pp 572–574 | Cite as

Dangling Bond Spins Controlling Recombination Dynamics of Excitons in Colloidal Nanocrystals and Nanoplatelets

  • A. V. Rodina
  • A. A. Golovatenko
  • E. V. Shornikova
  • D. R. Yakovlev
  • Al. L. Efros
XXV International Symposium “Nanostructures: Physics and Technology”, Saint Petersburg, Russia, June 26–30, 2017. Excitons in Nanostructures

Abstract

We show theoretically that spins of dangling bonds (DBSs) at the surface of colloidal nanostructures can be responsible for the dark exciton radiative recombination governing low temperature photoluminecence. The DBS-assisted dark exciton recombination is efficient when all spins are randomly oriented. The DBS polarization caused by external magnetic field or by the formation of the dangling bond magnetic polaron (DBMP) at low temperatures suppresses the DBS-assisted recombination. The temperature or magnetic field control on the DBS-polarization allows to detect experimentally the presence of DBS and DBS-assisted recombination in CdSe nanocrystals and 2D nanoplatelets.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • A. V. Rodina
    • 1
  • A. A. Golovatenko
    • 1
  • E. V. Shornikova
    • 2
    • 3
  • D. R. Yakovlev
    • 1
    • 2
  • Al. L. Efros
    • 4
  1. 1.Ioffe InstituteSt. PetersburgRussia
  2. 2.Experimentelle Physik 2Technische Universität DortmundDortmundGermany
  3. 3.Rzhanov Institute of Semiconductor PhysicsSiberian Branch of Russian Academy of SciencesNovosibirskRussia
  4. 4.Naval Research LaboratoryWashington DCUSA

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