Temperature dependence of the electron and hole Landé g -factors in CsPbI 3 nanocrystals embedded in a glass matrix.

Autor: Meliakov SR; P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia. melyakovs@lebedev.ru., Zhukov EA; P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia. melyakovs@lebedev.ru.; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Belykh VV; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Nestoklon MO; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Kolobkova EV; ITMO University, 199034 St Petersburg, Russia.; St Petersburg State Institute of Technology, 190013 St Petersburg, Russia., Kuznetsova MS; Spin Optics Laboratory, St Petersburg State University, 198504 St Petersburg, Russia., Bayer M; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Yakovlev DR; P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia. melyakovs@lebedev.ru.; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany.
Jazyk: angličtina
Zdroj: Nanoscale [Nanoscale] 2024 Oct 31. Date of Electronic Publication: 2024 Oct 31.
DOI: 10.1039/d4nr03132f
Abstrakt: The coherent spin dynamics of electrons and holes in CsPbI 3 perovskite nanocrystals in a glass matrix are studied by the time-resolved Faraday ellipticity technique in magnetic fields up to 430 mT across a temperature range from 6 K to 120 K. The Landé g -factors and spin dephasing times are evaluated from the observed Larmor precession of electron and hole spins. The nanocrystal size in the three studied samples varies from about 8 to 16 nm, resulting in exciton transition varying from 1.69 to 1.78 eV at a temperature of 6 K, allowing us to study the corresponding energy dependence of the g -factors. The electron g -factor decreases with increasing confinement energy in the NCs as a result of NC size reduction, and also with increasing temperature. The hole g -factor shows the opposite trend. Model analysis shows that the variation of g -factors with NC size arises from the transition energy dependence of the g -factors, which becomes strongly renormalized by temperature.
Databáze: MEDLINE
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