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Applied Physics Letters / Volume 71 / Issue 8

Appl. Phys. Lett. 71, 1098 (1997); http://dx.doi.org/10.1063/1.119738 (3 pages)

Persistent photoconductivity in n-type GaN

Michèle T. Hirsch, J. A. Wolk, W. Walukiewicz, and E. E. Haller

Lawrence Berkeley National Laboratory and University of California at Berkeley, Berkeley, California 94720

(Received 11 February 1997; accepted 24 June 1997)

We report on the spectral and temperature dependence of persistent photoconductivity (PPC) in metal-organic chemical vapor deposition grown unintentionally doped n-type GaN. The PPC effect is detectable up to temperatures of at least 352 K, the highest temperature used in this study. At 77 K, the conduction persists at a level 80% higher than the equilibrium dark conduction for over 104 s after removing the excitation. We have determined the spectral dependence for the optical cross section for PPC and obtain an optical ionization energy of ∼2.7 eV. The temperature dependence of the photoconductivity decay and its nonexponential shape are explained by a distribution of capture barriers with a mean capture barrier of 0.2 eV and a width of ∼26 meV. © 1997 American Institute of Physics.

© 1997 American Institute of Physics

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KEYWORDS and PACS

Keywords

gallium compounds, III-V semiconductors, wide band gap semiconductors, semiconductor thin films, CVD coatings, electron traps, GALLIUM NITRIDES, PHOTOCONDUCTIVITY, TEMPERATURE DEPENDENCE, DOPED MATERIALS, THIN FILMS, CHEMICAL VAPOR DEPOSITION, METASTABLE STATES, DECAY

PACS

  • 73.61.Ey

    III-V semiconductors

  • 72.80.Ey

    III-V and II-VI semiconductors

  • 72.40.+w

    Photoconduction and photovoltaic effects

  • 73.50.Pz

    Photoconduction and photovoltaic effects

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

  • 73.50.Gr

    Charge carriers: generation, recombination, lifetime, trapping, mean free paths

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.119738

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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