Abstract
A new ternary compound is synthesized for the first time, and bulk CuIn5Te8 single crystals are grown by directed crystallization of near-stoichiometric melt. It is established from X-ray diffraction patterns of grown crystals that they exhibit the structure of imperfect chalcopyrite with parameters of the unit cell of CuIn5Te8, which were close to those known for the CuInTe2 ternary compound with the composition index n = 0. First, photosensitive structures are fabricated based on CuIn5Te8 crystals, and photosensitivity spectra are obtained for them; it is shown that it is possible to achieve broadband photosensitivity under illumination of the barrier side of these crystals. From the analysis of photosensitivity spectra, the character of band-to-band transitions and corresponding energies of these transitions in CuIn5Te8 are determined. This opens up prospects to use this new semiconductor in photoconverters of solar radiation.
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