Abstract

The lithium containing I–III–VI chalcopyrites have long been theorized to have large nonlinear susceptibilities.¹ Along with their larger band gaps, compared to the noble metal compounds, this makes them of potential use for optoelectronic devices which operate in the near IR to visible region of the spectrum. However, the difficulty of handling the alkali metals and the propensity of the chalcogens to form high-pressure gases at elevated temperatures have resulted in few studies of this class of compound. LilnSe₂ has been successfully prepared by directional solidification.² We have attempted to improve on the original growth by iodine transport. We will also report on a calculation of the dielectric function of LilnS₂obtained from Kramers-Kronig analysis of the reflectivity measured between 0.5 and 5.0 eV. Last, we report variations of electrical resistivity and the dielectric function with the stoichiometry of the starting mixture.

© 1988 Optical Society of America