Abstract

The synthesis of single-phase γ-In 2Se 2.5Te 0.5 alloy thin films with low substitution of selenium by tellurium was carried out by a direct method from In and (Se 1−xTe x) thermal evaporation and a subsequent heat treatment. A correlation between the film properties and alloy composition was observed. These γ-In 2Se 2.5Te 0.5 films changed from p-type conduction to n-type by the addition of Te, and showed a high optical absorption coefficient (α > 10 4 cm −1) and an energy gap of about 1.45 eV, narrower that of γ-In 2Se 3 thin films. An improvement of the electronic transport properties, i.e., the carrier concentration and mobility, was achieved as proved by electrical conductivity and Hall measurements.

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