Abstract
CuInSe2 alloys with the stoichiometric Cu : In ratio and varying Se content were studied by x-ray diffraction. The lattice parameters of the alloys, atomic positional parameterx, and the bond lengths lcu-se and lin-Se were determined. The lattice parameters were found to increase with decreasing Se content on the Se-poor side of CuInSe2 and to pass through a flat minimum around 50.5 at. % Se. The results are interpreted as indicating that the dominant intrinsic defects in Se-deficient CuInSe2 are Cu interstitials. In the Se-enriched alloys containing more than ≃50.5 at. % Se, the dominant defects are cation vacancies, Se interstitials, and/or SeCu and SeIn antisite defects.
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