Optical absorption and photoluminescence of CuAlTe ₂

Abstract

The bulk crystals of the CuAlTe 2 semiconductor ternary compound with the chalcopyrite structure were prepared, and their optical properties were investigated. It was determined that the value of band gap energy equals 1.69 and 1.65 eV at 105 and 293 K, respectively. The photoluminescence spectra were measured for the first time and contain broad bands with peaks at 1.09 eV (78 K) and 1.03 eV (293 K). The full width at half maximum (FWHM) for both temperatures is 0.28 eV. The origin of this band is associated with band to deep acceptor optical transition.

Electronic Properties of I-III-VI2 Ternary Chalcopyrites

“…The Ternary I-III-VI2 and II-IV-V2 semiconducting compounds, which crystallize in chalcopyrite structure, have drawn much attention in recent years [1][2][3] . They form a large group of semiconducting materials with diverse optical, electrical, mechanical, thermal and structural properties [4][5][6][7][8][9] . Ternary chalcopyrite semiconductors appear to be promising candidates for solar cells applications 7 , light emitting diodes 10 , non-linear optics 11 and optical frequency conversion applications in all solid state based tunable laser system.…”