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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 4 — Feb. 19, 2007
  • pp: 1898–1906

Temperature dependence of surface photovoltage spectroscopy in vertically coupled self-organized InAs/GaAs quantum dots

C. H. Chan, Y. S. Huang, J. S Wang, and K. K. Tiong  »View Author Affiliations


Optics Express, Vol. 15, Issue 4, pp. 1898-1906 (2007)
http://dx.doi.org/10.1364/OE.15.001898


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Abstract

The surface photovoltage (SPV) spectra of a series of vertically stacked self-organized InAs/GaAs quantum dot (QD)-based laser structures with different spacer layer (SL) thickness were obtained as a function of temperature (77 K ≤ T ≤ 300 K). A decrease of the compressive stress for thinner SL samples arising from coherent relaxation enables us to designate the effect of material intermixing as the most probable mechanism of the energetic blueshift of the observed structures. The turnaround characteristic of the temperature-dependent spectral intensity shows that the reduced SPV signal at higher temperature is limited by the carrier scattering and at lower temperature it is governed by the magnitude of built-in electric field and the escape efficiency of the photogenerated carriers. The dot states to be blueshifted by material intermixing are expected to have higher escape rate for carriers out of QDs, thus resulting in lower measurable temperature for the detected SPV signal. The relatively higher signal at low temperature for the 10 nm SL sample provides a direct evidence of the tunneling process of carriers in the stacked QD layers.

© 2007 Optical Society of America

OCIS Codes
(240.6490) Optics at surfaces : Spectroscopy, surface
(240.7040) Optics at surfaces : Tunneling
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Spectroscopy

History
Original Manuscript: October 25, 2006
Revised Manuscript: January 23, 2007
Manuscript Accepted: February 5, 2007
Published: February 19, 2007

Citation
C.H. Chan, Y. S. Huang, J. S. Wang, and K. K. Tiong, "Temperature dependence of surface photovoltage spectroscopy in vertically coupled self-organized InAs/GaAs quantum dots," Opt. Express 15, 1898-1906 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-4-1898


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