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First investigation of the atomic structure of (112) and (112) CuInSe2 surfaces

✍ Scribed by A. Kahn; P. Corvini; S. Wagner; K.J. Bachmann

Publisher
Elsevier Science
Year
1986
Weight
652 KB
Volume
16
Category
Article
ISSN
0379-6787

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✦ Synopsis

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. Nonstoichiometry at the surface and randomization of the metal sublattices by ion sputtering are invoked to explain this result.

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The surface structure ~,nd the electronic properties of the high-index molecular beam epitaxy (MBE)prepared GaAs surfaces (112)A and B as well as (113)A and B were investigated in sire by low-energy electron diffraction and surface core level spectroscopy. Under MBE conditions, both (112) surfaces a