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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 3 — Feb. 1, 2014
  • pp: 567–570

Composition-dependent electron transport in CdSxSe1−x nanobelts: a THz spectroscopy study

Hongwei Liu, Junpeng Lu, Sing Hai Tang, Chorng Haur Sow, and Xinhai Zhang  »View Author Affiliations


Optics Letters, Vol. 39, Issue 3, pp. 567-570 (2014)
http://dx.doi.org/10.1364/OL.39.000567


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Abstract

We present a study on the composition-dependent electron transport in ternary CdSxSe1x nanobelts at equilibrium and nonequilibrium conditions via THz spectroscopy. The measured spectra are analyzed using a Drude–Smith model combined with a harmonic oscillator. The physical origin of parameters in the Drude–Smith model is studied in detail. Under equilibrium conditions, the surface depletion region is the dominant factor to free-carrier backscattering. However, under nonequilibrium conditions, the influence of the surface depletion region is masked by the high bulk concentration and the free carriers are mainly localized by composition disorder. The contributions from different mechanisms to the carrier mobility are also explored. In equilibrium, alloy scattering is the most vital scattering mechanism for nanobelts with x=0.250.9 since composition disorder is significant in this range. On the other hand, the effect of electron–phonon interaction increases under photoexcitation.

© 2014 Optical Society of America

OCIS Codes
(300.6250) Spectroscopy : Spectroscopy, condensed matter
(160.4236) Materials : Nanomaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: November 28, 2013
Revised Manuscript: December 20, 2013
Manuscript Accepted: December 20, 2013
Published: January 24, 2014

Citation
Hongwei Liu, Junpeng Lu, Sing Hai Tang, Chorng Haur Sow, and Xinhai Zhang, "Composition-dependent electron transport in CdSxSe1−x nanobelts: a THz spectroscopy study," Opt. Lett. 39, 567-570 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-3-567


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