Journal
SURFACE SCIENCE
Volume 603, Issue 22, Pages 3282-3285Publisher
ELSEVIER
DOI: 10.1016/j.susc.2009.09.014
Keywords
II-VI Semiconductors; ZnSe; Surface states; Photoacoustics
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This paper presents results of the photoacoustic (PA) spectral studies of a series of ZnSe crystals with differently prepared surfaces. All samples exhibited the surface absorption connected with defects states located on their surfaces. The quality of the surface preparation is expressed by the surface absorption coefficient spectra of the samples times the thickness of a damaged layer. In this paper both theoretical and experimental photoacoustic amplitude and phase spectra as also the corresponding computed surface and volume optical absorption coefficient spectra of the samples with differently prepared surfaces are presented and discussed. This is the first attempt of the quantitative evaluation of the surface quality of the samples from the photoacoustic experimental spectra. (C) 2009 Elsevier B.V. All rights reserved.
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