Electroreflectance of CuInSe 2 Single Crystals
- 1 May 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (5A) , L543
- https://doi.org/10.1143/jjap.36.l543
Abstract
Electrolyte electroreflectance (ER) measurements have been carried out at room temperature (297 K) on a series of bulk single crystals of CuInSe2 prepared by the normal freezing method with various Cu/In ratios. The Cu-rich crystals exhibited sharp ER peaks and the AB-transition energy is 1.026 eV, while In-rich crystals exhibited broader ER peaks and smaller AB-transition energies (1.00–1.02 eV) than those of the Cu-rich ones. The spin-orbit splitting of the uppermost valence band is 0.236 eV. The effect of the Cu/In ratio on the ER spectra is discussed in terms of the Urbach energy determined by optical absorption measurement, and the bandgap energy of the stoichiometric CuInSe2 crystal is discussed.Keywords
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