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Proceedings Paper

Kelvin probe measurements of p-type GaN
Author(s): M. Foussekis; X. Ni; H. Morkoç; M. A. Reshchikov; A. A. Baski
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Paper Abstract

We have studied the surface photovoltage (SPV) for band-to-band illumination on a variety of p-type (Mg-doped) GaN samples. In particular, differences in the steady-state and transient SPV have been investigated in air and vacuum for samples grown by hydride vapor phase epitaxy (HVPE) or metal-organic chemical vapor deposition (MOCVD). The SPV spectra for both samples behave in a similar manner, but larger SPVs are generated for HVPE vs. MOCVD samples under identical illumination conditions. Interestingly, we have found that p-type GaN can be sensitive to the illumination geometry, where illumination of the electrical contacts results in an anomalous "offset" of the SPV signal. Regardless of illumination geometry, such offsets always appear in the case of MOCVD samples, whereas they do not appear for HVPE samples when the contacts are not illuminated. Since we have never observed such behavior for n-type samples, it appears that the stability of p-type samples under illumination may be an issue.

Paper Details

Date Published: 3 March 2011
PDF: 6 pages
Proc. SPIE 7939, Gallium Nitride Materials and Devices VI, 79390A (3 March 2011); doi: 10.1117/12.876166
Show Author Affiliations
M. Foussekis, Virginia Commonwealth Univ. (United States)
X. Ni, Virginia Commonwealth Univ. (United States)
H. Morkoç, Virginia Commonwealth Univ. (United States)
M. A. Reshchikov, Virginia Commonwealth Univ. (United States)
A. A. Baski, Virginia Commonwealth Univ. (United States)

Published in SPIE Proceedings Vol. 7939:
Gallium Nitride Materials and Devices VI
Jen-Inn Chyi; Yasushi Nanishi; Hadis Morkoç; Joachim Piprek; Euijoon Yoon, Editor(s)

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