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Photoluminescence excitation spectroscopy of highly compensated CuGaSe 2
Author(s) -
Siebentritt Susanne,
Papathanasiou Niklas,
LuxSteiner Martha
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541130
Subject(s) - photoluminescence , photoluminescence excitation , excitation , spectral line , spectroscopy , absorption spectroscopy , materials science , absorption (acoustics) , emission spectrum , analytical chemistry (journal) , molecular physics , chemistry , optoelectronics , atomic physics , optics , physics , chromatography , quantum mechanics , astronomy , composite material
The photoluminescence excitation spectra are presented of weakly and highly compensated CuGaSe 2 , grown under Cu‐excess and under Cu‐deficiency, respectively. An overlap is observed between the photoluminescence and the excitation spectrum in the Cu‐poor material, indicating fluctuating potentials due to high compensation, whereas no overlap is observed in material grown under Cu‐excess, indicating flat bands. The photoluminescence excitation spectra can be used as measure for the absorption spectrum in the case of flat bands, but not in the case fluctuating potentials, where different emission energies probe different depths of the fluctuations. Methods for the determination of the fluctuation amplitude from the photoluminescence and the excitation spectra are discussed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)