Growth, structure and thermal properties of CuAl_xGa_1‐xSe₂ alloys

Abstract

Ingots of the CuAl x Ga 1-x Se 2 (0 ≤ x ≤ 1) alloys system were prepared by direct fusion of the stoichiometric mixture of the elements. The analysis of X-ray Powder Diffraction data showed the presence of one single phase with chalcopyrite tetragonal structure at room temperature for all the studied compositions. The lattice parameters, a and c, and the bond lengths were calculated. The phase transition temperatures were obtained by the onset method from Differential Thermal Analysis measurements performed on samples sealed in evacuated quartz ampoules. Fusion or transition enthalpies were determined from the area of the corresponding DTA peak.

CuAlxGa1−xSe2 thin films for photovoltaic applications: Structural, electrical and morphological analysis

“…3 and 4 include the standard values for the ternary chalcopyrites, CuGaSe 2 and CuAlSe 2 , and the data reported by Castro et al for bulk CAGS crystals. A linear dependence of the lattice parameters with the Al content is observed in both cases and has been reported by other authors for CAGS crystals [18,19]. This behaviour follows the Vegard's law in opposition to other Cubased quaternary compound [20].…”

Influence of the annealing temperature on CuAlxGa1−xSe2 thin films obtained by selenization

“…2) which imply that the tetragonal distortion, c / a , also increases and is closer to 2. However, it is at 550 °C when the lattice parameter, a , of the quaternaries is more homogeneous and closer to the standard values for ternaries 18.…”