Structural and Electrical Properties of Evaporated-Amorphous and Vitreous-Amorphous V-VI Compounds

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Abstract
It is not widely realized that the structure of evaporated films differs significantly from the structure of vitreous bulk specimens. The atomic arrangement of vitreous specimens retains the short range order of the liquid from which they were prepared, whereas evaporated films are built up by the individual arrival of molecules and hence are inherently more random. The composition of these molecules depends on the composition of the evaporant and the evaporation conditions. Inspection of the radial distribution functions (RDF) of evaporated As2S3, As2Se3, and As2Te3 show consistently the appearance of an additional peak in the RDF of evaporated films. The peak is absent in the vitreous form and disappears when evaporated films are annealed in the vicinity of the glass transition temperature. These structural differences are reflected in the electronic properties of evaporated and vitreous samples.

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