Growth, Structure and Optical Properties of ZnSe:Co Thin Films

ZnSe:Co thin films were grown on quartz substrates at various ambient pressure by pulsed laser deposition. The propagation of plasma plume, the structure and optical properties of films at pressure of 1Pa to 10Pa had been investigated. With the ambient pressure increased, the angle of divergence and propagation distance of plasma plume changed, the crystal structure of films investigated by XRD showed that the crystal quality of films was promoted. The optical band gap and refractive index were analyzed by the transmission spectra. The optical band gap first decrease then increase with increasing deposition pressure, which may be associated with the quantum confinement effect. The refractive index increased with increasing deposition pressure, which may be due to the promotion of the film density. The dispersion parameters, E-0, E-d, the static refract ive index (n(0)) and static dielectric constant (e(0)) were calculated according to the single oscillator model.