Affiliation:
1. Nagaoka University of Technology
2. National Institute for Materials Science
Abstract
High-resolution photoluminescence (PL) measurement was carried out for copper
aluminum disulfide (CuAlS2) powder at 12 K. Several sharp PL lines were observed in the range
from 3.580 to 3.320 eV. The emission peaks at photon energies from 3.566 to 3.459 eV were
attributed to free-exciton (FE) and bound-excitons (BE). The several weak emissions at below
3.476 eV were clarified to be phonon replicas (PR) by Raman scattering and in the viewpoint of
exciton-phonon interaction. We observed the one, two and three-phonon replicas related to E(LO, TO)
and B2(LO, TO) vibrational modes in chalcopyrite structure. It was suggested that the strong
interaction between excitons and optical phonons took place in obtained CuAlS2 powder.
Publisher
Trans Tech Publications, Ltd.