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Optically Detected Magnetic Resonance Study of Core-Shell and Alloy Nanocrystals of HgTe and CdS

Published online by Cambridge University Press:  21 March 2011

L. Fradkin ,
L. Langof  and
E. Lifshitz
L. Fradkin
Affiliation:
Dept. of Chemistry and Solid State Inst. Technion, Haifa 32000, Israel, A. Rogach, N. Gaponik, H. Weller, and A. Eychmüller Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
L. Langof
Affiliation:
Dept. of Chemistry and Solid State Inst. Technion, Haifa 32000, Israel, A. Rogach, N. Gaponik, H. Weller, and A. Eychmüller Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
E. Lifshitz
Affiliation:
Dept. of Chemistry and Solid State Inst. Technion, Haifa 32000, Israel, A. Rogach, N. Gaponik, H. Weller, and A. Eychmüller Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 692: Symposium H – Progress in Semiconductor Materials for Optoelectronic Applications , 2001 , H6.32.1
Copyright
Copyright © Materials Research Society 2002

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References

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