Abstract
Сu1 – xAl0.25In0.75Se2 copper-deficient solid solutions with the chalcopyrite structure have been prepared by elemental synthesis from Cu, In, Al, and Se, and their unit-cell parameters have been determined for the first time as functions of x in the range 0 < x ≤ 0.20. It has been shown that the band peaking at 1.320 eV in the 78-K cathodoluminescence spectra of the Сu1 – xAl0.25In0.75Se2 solid solutions is most likely due to CuM and MCu (M = Al, In) antisite defects resulting from exchange of atoms between the copper and indium–aluminum sublattices in the chalcopyrite structure and that the band peaking at 1.245 eV arises from Cu2+ · VCu associates, which are predominant defects.
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