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

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

doi:10.1557/proc-692-h6.32.1

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

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

Research output: Journal Publications and Reviews › RGC 22 - Publication in policy or professional journal

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) F_e=1/2 and F_h=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.

Original language	English
Pages (from-to)	289-294
Journal	Materials Research Society Symposium - Proceedings
Volume	692
DOIs	https://doi.org/10.1557/proc-692-h6.32.1
Publication status	Published - 2002
Externally published	Yes
Event	Progress in Semiconductor Materials for Optoelectronic Applications - Boston, MA, United States Duration: 26 Nov 2001 → 29 Nov 2001

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title = "Optically detected magnetic resonance study of core-shell and alloy nanocrystals of HgTe and CdS",

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.",

author = "L. Fradkin and L. Langof and E. Lifshitz and A. Rogach and N. Gaponik and H. Weller and A. Eychm{\"u}ller",

year = "2002",

doi = "10.1557/proc-692-h6.32.1",

language = "English",

volume = "692",

pages = "289--294",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

note = "Progress in Semiconductor Materials for Optoelectronic Applications ; Conference date: 26-11-2001 Through 29-11-2001",

}

TY - JOUR

T1 - Optically detected magnetic resonance study of core-shell and alloy nanocrystals of HgTe and CdS

AU - Fradkin, L.

AU - Langof, L.

AU - Lifshitz, E.

AU - Rogach, A.

AU - Gaponik, N.

AU - Weller, H.

AU - Eychmüller, A.

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/0036061411

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0036061411&origin=recordpage

U2 - 10.1557/proc-692-h6.32.1

DO - 10.1557/proc-692-h6.32.1

M3 - RGC 22 - Publication in policy or professional journal

SN - 0272-9172

VL - 692

SP - 289

EP - 294

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Progress in Semiconductor Materials for Optoelectronic Applications

Y2 - 26 November 2001 through 29 November 2001

ER -

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

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