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

Journal Article · Tue May 15 04:00:00 EDT 2018 · Semiconductors

DOI:https://doi.org/10.1134/S1063782618050263· OSTI ID:22749963

Golovatenko, A. A. ^[1]; Shornikova, E. V. ^[2]; Yakovlev, D. R. ^[1]; Efros, Al. L. ^[3]

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1. Ioffe Institute (Russian Federation)
2. Technische Universität Dortmund, Experimentelle Physik 2 (Germany)
3. Naval Research Laboratory (United States)

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.

• OSTI ID: 22749963
• Journal Information: Semiconductors, Journal Name: Semiconductors Journal Issue: 5 Vol. 52; ISSN SMICES; ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM SELENIDES
EXCITONS
MAGNETIC FIELDS
MAGNETIZATION
NANOSTRUCTURES
RECOMBINATION
SPIN
TEMPERATURE RANGE 0065-0273 K