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Subpicosecond carrier dynamics in low-temperature grown GaAs as measured by time-resolved terahertz spectroscopy

J. Appl. Phys. 90, 5915 (2001); doi:10.1063/1.1416140

Issue Date: 15 December 2001

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Matthew C. Beard, Gordon M. Turner, and Charles A. Schmuttenmaer
Chemistry Department, Yale University, 225 Prospect Street, P.O. Box 208107, New Haven, Connecticut 06520-8107
The transient photoconductivity in a 1 µm layer of low temperature grown GaAs (LT-GaAs) on a GaAs substrate was measured using time-resolved terahertz spectroscopy. When photoexcitation occurs at 400 nm we find a time-dependent mobility that increases from 400±100 to 1100±100  cm2 V–1 s–1 with a time constant of 2 ps. Photoexcitation at 800 nm produces a time-independent mobility of 3000±500  cm2 V–1 s–1. We determine the carrier lifetime in LT-GaAs to be 1.1 ± 0.1 ps. ©2001 American Institute of Physics.
History: Received 23 March 2001; accepted 10 September 2001
Permalink: http://link.aip.org/link/?JAPIAU/90/5915/1
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KEYWORDS and PACS

Keywords
PACS
  • 72.80.Ey
    Electronic transport in condensed matter Conductivity of specific materials III–V and II–VI semiconductors
  • 72.40.+w
    Electronic transport in condensed matter Photoconduction and photovoltaic effects
  • 72.20.Jv
    Electronic transport in condensed matter Conductivity phenomena in semiconductors and insulators Charge carriers: generation, recombination, lifetime, and trapping
  • 78.47.+p
    Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter
  • 72.20.Ee
    Electronic transport in condensed matter Conductivity phenomena in semiconductors and insulators Mobility edges; hopping transport
  • 78.70.Gq
    Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter Interactions of particles and radiation with matter Microwave and radio-frequency interactions
  • YEAR: 2001

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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