Electrical and Optical Properties of CdS-MnS Single Crystals

Single crystals of Cd 1- x Mn x S ( x ≤0.4) were prepared by Bridgman-Stockbarger method under high gas pressure and electrical and optical properties of these crystals were measured. The mobility of electrons was found to be significantly influenced by the alloy scattering. In the optical absorption spectra, three absorption peaks due to Mn 2+ ions were observed at 455, 480, and 510 mµ, similar to the case of Zn 1- x Mn x S crystals. The band gap of Cd 1- x Mn x S varies anomalously with x ; it shows a minimum at x ∼0.03 and increases linearly with x for x ≥0.1. The reason for the appearance of this minimum at small x has not been understood.