"Физика и техника полупроводников"
Издателям
Вышедшие номера
Dangling bond spins controlling recombination dynamics of excitons in colloidal nanocrystals and nanoplatelets
Переводная версия: 10.1134/S1063782618050263
Rodina A.V.1, Golovatenko A.A.1, Shornikova E.V.2,3, Yakovlev D.R.1,2, Efros Al.L.4
1Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
2Experimentelle Physik 2, Technische Universitat Dortmund, Dortmund, Germany
3A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
4Naval Research Laboratory, Washington DC, USA
Email: Anna.rodina@mail.ioffe.ru
Выставление онлайн: 19 апреля 2018 г.

We show theoretically that spins of dangling bonds (DBS) at 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. Acknowledgement This work has been supported in part by the Government of Russia (project number 14.Z50.31.0021, leading scientist M.Bayer), by the RFBR (Grant No 17-02-01063), and by the Deutsche Forschungsgemeinschaft in the frame of ICRC TRR 160.

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