Optical absorption of Cd1-xCoxTe single crystals

Cd1-xCoxTe single crystals were grown by the vertical Bridgman method. We m easured the optical absorption in the range from 750 to 3000 nm at room tem perature and at 4.8 K. Several absorption bands were detected and assigned to electronic transitions between the splitting energy levels of Co2+ Sited at the Td symmetry of the CdTe host lattice. The crystal-held parameter (D q), the Racah parameter (B), and the spin-orbit coupling parameter (lambda) were determined. In addition, the band-gap energy was obtained as a functi on of cobalt composition x.