The effects of different dopant on the optical parameters for selenium tellurium thin films

Glasses of (Se90Te10)95M5 (where M = Zn and Bi) were prepared using a melt-quench procedure. These incorporated elements were chosen as examples of transition metals and basic metal groups, respectively. Thin films of these glasses at a thickness of 100 nm were evaporated onto cleaned glass substrates. Structural investigations were studied using XRD, SEM, and DSC. The glass transition, Tg, and Onset crystallization behavior of glasses, Tc of (Se90Te10)95M5 (M = Zn and Bi) alloys were analyzed using DSC at a heating rate of 15 K min-1. XRD patterns confirmed the amorphous nature of the films. The absorption coefficient, alpha, and refractive index, n, were obtained for (Se90Te10)95M5 (M = Zn and Bi) films. The Eg values of Se90Te10 increase as dopant by Zn. Conversely, it decreases as dopant by Bi. Moreover, the optical constants of (Se90Te10)95M5 (M = Zn and Bi) films were estimated. The estimated results confirm the applicability of modifying samples to be used using in optoelectronics applications.