The authors report on Raman scattering of CuAl S2 in order to study the influences of intrinsic defects on luminescence properties. The A1 mode is dominated in stoichiometric samples, whereas sulfur-poor conditions prepared at high temperatures (≥800 °C) cause defect-specific shift and broadening. They also find that additional mode (at 330 cm-1) caused by antisite defects is resonated at 2.16 eV excitation, in accordance with visible luminescence attributed to donor-acceptor pair (DAP) emission in photoluminescence. These results suggest that the DAP emissions may be caused by the defect complexes such as AlCu - VCu and VS - VCu, which reduces ultraviolet excitonic emission in this system.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)