LATTICE DYNAMICS OF AIIBIVCV2 AND AIBIIICVI2 SEMICONDUCTORS WITH CHALCOPYRITE LATTICE IN A RIGID-ION MODEL

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Abstract
A model of unpolarizable point ions linked by short-range forces with their nearest neighbours is applied to the investigation of lattice dynamics and related optical properties in the infrared of chalcopyrite. Compounds ZnSiP2, CdGcP2 and CuAlS2. The distribution of effective charges between the ions agrees qualitatively with that which follows from Phillips' dielectric theory of ionicity. IR-active frequencies and the oscillator strengths are in good agreement with the experiment. The most interesting feature of the calculated spectra is the presence of forbidden bands

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