Influence of gamma-irradiation on the optical and structural properties of Se85Te15-xBix nano-thin chalcogenide films. (November 2021)

• Record Type: Journal Article
• Authors: Khan, Shamshad A.; Sahani, R.M.; Tripathi, Ravi P.; Akhtar, M. Shaheer; Srivastava, Archana
• Is Part Of: Radiation physics and chemistry. Volume 188(2021)
• Publication Date: 2021-11
• Subjects: Chalcogenide -- Structural -- Absorption coefficient -- Band gap -- Gamma irradiation; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2021.109659
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: In this work, bulk Se85 Te15-x Bix chalcogenide glasses were synthesized by melt quenching technique. The nano-thin chalcogenide films of Se85 Te15-x Bix alloys with thickness 40 nm were deposited on glass/Si wafer by Physical Vapour Condensation Technique (PVCT). Their optical and structural properties were analysed by the exposure of different gamma irradiation doses. High resolution X-ray diffraction (HRXRD) and field emission scanning electron microscopy (FESEM) were used to demonstrate the crystalline and morphological properties. The phase transformation studies of nano-thin films were carried out before and after irradiation by 3, 6, and 9 kGy doses of gamma (γ ) rays. The optical parameters such as absorption coefficient, Urbach tail and extinction coefficient were found to be varied with the gamma irradiation doses. Importantly, the indirect allowed band gap increased as increasing the gamma irradiation doses. These notable shifts in the optical band gap and absorption coefficient values can be explained by the increment in disorderness and lattice strain due to gamma irradiation. Highlights: Bulk Se85 Te15-x Bix chalcogenide glasses were synthesized by melt quenching technique. Se85 Te15-x Bix thin films were deposited on glass/Si wafer by PVCT. Phase transformation of Se85 Te15-x Bix thin films demonstrate before and after gamma irradiation. Grown thin films showed indirect band gap and glassy nature.