S-vacancy energy levels in AgInS2

Abstract
A luminescence study of energy levels due to lattice defects in AgInS2, which belongs to the I‐III‐VI2 compounds, is reported in this article. As‐grown and annealed crystals under maximum or minimum sulfur pressure have been used. We have found a donor level at 70 meV, an acceptor level at 70 meV, and a level (acceptor or donor) at 100 meV. Two of these levels (at least) are attributed to the sulfur vacancy.