Optically detected magnetic resonance study of core-shell and alloy nanocrystals of HgTe and CdS

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Author(s)

  • L. Fradkin
  • L. Langof
  • E. Lifshitz
  • N. Gaponik
  • H. Weller
  • A. Eychmüller

Detail(s)

Original languageEnglish
Pages (from-to)289-294
Journal / PublicationMaterials Research Society Symposium - Proceedings
Volume692
Publication statusPublished - 2002
Externally publishedYes

Conference

TitleProgress in Semiconductor Materials for Optoelectronic Applications
PlaceUnited States
CityBoston, MA
Period26 - 29 November 2001

Abstract

The synthesis of HgTe nanocrystals (NCs), coated with a CdS shell, presumably results in the formation of HgTe/CdS, HgTe/CdHgS core-shell structures or separated CdHgS alloys. Photoluminescence (PL), continuous-wave (cw) and time-resolved optically detected magnetic resonance (ODMR) spectroscopy examined the magneto-optical properties of the dominating resonance aforementioned products. The cw ODMR measurements indicated that the NCs exhibit a band, centered at 0.39 Tesla, corresponding to an excited state electron (e) and hole (h) spin manifold, with total angular momentum (F=S+L) Fe=1/2 and Fh=3/2, respectively. Theoretical simulation of the ODMR band revealed an anisotropy of the g-factor, indicating the existence of trapped carriers' at a mixed Cd-Hg tetrahedral site, confirming the formation of an alloy component. The time-resolved ODMR measurements reveal a characteristic radiative decay time and spin-lattice relaxation time of these trapped carriers of hundreds of microseconds.

Citation Format(s)

Optically detected magnetic resonance study of core-shell and alloy nanocrystals of HgTe and CdS. / Fradkin, L.; Langof, L.; Lifshitz, E. et al.
In: Materials Research Society Symposium - Proceedings, Vol. 692, 2002, p. 289-294.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal