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

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.

Authors:
;  [1];  [2];  [1];  [3]
  1. Ioffe Institute (Russian Federation)
  2. Technische Universität Dortmund, Experimentelle Physik 2 (Germany)
  3. Naval Research Laboratory (United States)
Publication Date:
OSTI Identifier:
22749963
Resource Type:
Journal Article
Journal Name:
Semiconductors
Additional Journal Information:
Journal Volume: 52; Journal Issue: 5; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7826
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SELENIDES; EXCITONS; MAGNETIC FIELDS; MAGNETIZATION; NANOSTRUCTURES; RECOMBINATION; SPIN; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Rodina, A. V., E-mail: Anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., Yakovlev, D. R., and Efros, Al. L. Dangling Bond Spins Controlling Recombination Dynamics of Excitons in Colloidal Nanocrystals and Nanoplatelets. United States: N. p., 2018. Web. doi:10.1134/S1063782618050263.
Rodina, A. V., E-mail: Anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., Yakovlev, D. R., & Efros, Al. L. Dangling Bond Spins Controlling Recombination Dynamics of Excitons in Colloidal Nanocrystals and Nanoplatelets. United States. doi:10.1134/S1063782618050263.
Rodina, A. V., E-mail: Anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., Yakovlev, D. R., and Efros, Al. L. Tue . "Dangling Bond Spins Controlling Recombination Dynamics of Excitons in Colloidal Nanocrystals and Nanoplatelets". United States. doi:10.1134/S1063782618050263.
@article{osti_22749963,
title = {Dangling Bond Spins Controlling Recombination Dynamics of Excitons in Colloidal Nanocrystals and Nanoplatelets},
author = {Rodina, A. V., E-mail: Anna.rodina@mail.ioffe.ru and Golovatenko, A. A. and Shornikova, E. V. and Yakovlev, D. R. and Efros, Al. L.},
abstractNote = {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.},
doi = {10.1134/S1063782618050263},
journal = {Semiconductors},
issn = {1063-7826},
number = 5,
volume = 52,
place = {United States},
year = {2018},
month = {5}
}