The atomic structure of (112) and (112) surfaces of CuInSe2 has been studied with low energy electron diffraction. The surfaces were prepared by sputtering and annealing of single crystals in ultrahigh vacuum. The symmetry and size of the resulting unit cells on both surfaces were found to be incompatible with the substitutional ordering of the metal sublattices. Non-stoichiometry at the surface and randomization of the metal sublattices by ion sputtering are invoked to explain this result.
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