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Near‐edge Optical Properties of CuInSe 2 Studied by Photoacoustic Spectroscopy
Author(s) -
Zegadi A.,
Neumann H.,
Slifkin M. A.,
Tomlinson R. D.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280113
Subject(s) - photoacoustic spectroscopy , photon energy , absorption edge , spectroscopy , spectral line , absorption (acoustics) , impurity , photon , absorption spectroscopy , chemistry , photoacoustic imaging in biomedicine , range (aeronautics) , atomic physics , analytical chemistry (journal) , materials science , molecular physics , optics , physics , optoelectronics , band gap , organic chemistry , chromatography , quantum mechanics , astronomy , composite material
Optical absorption spectra of n‐type CuInSe 2 single crystals were evaluated by means of photoacoustic spectroscopy in the photon energy range from 0.94 to 1.02 eV. At photon energies below 0.99 eV the spectra exhibit exponential tails that are ascribed to the presence of shallow impurity states. At higher photon energies the absorption coefficients follow the relation for direct allowed optical transitions between parabolic bands. The parameters of this relation are determined and compared with previous measurements.