Photoluminescence and Raman spectroscopy of polycrystalline AgInTe2

Abstract We studied the photoluminescence characteristics of polycrystalline chalcopyrite AgInTe 2 . The spectra showed three bands. The first band has the maximum at 1.023 eV, and it has one LO-phonon replica with the energy of 25 meV. The second band has the maximum at 0.959 eV and two phonon replicas with the same LO-phonon energy. The third broad band has the maximum at 0.741 eV. The dependence of the spectra on the temperature and the excitation power were recorded. According to the observed j-shift and thermal quenching, the 0.959 eV band can be assigned to a donor–acceptor pair recombination with the activation energy of 35 meV. Room temperature unpolarised Raman spectrum revealed six peaks. The lines observed at 122, 140, 217, and 266 cm −1 are assigned to A 1 , E 1 , or B 1 , E+B 2 , and longitudinal optical E modes, respectively.