Experimental and Theoretical NANOTECHNOLOGY (ETN) abbreviated as Exp. Theo. NANOTECHNOLOGY is a multidisciplinary peer-reviewed and open access journal. It includes specialized research papers, short communications, reviews and selected conference papers in special issues on the characterization, synthesis, processing, structure and properties of different principles and applications of nanotechnology with focus on advantageous achievements and applications for the specialists in engineering, chemistry, physics, materials science and medicine. ETN covers and publishes all aspects of fundamental and applied researches of experimental and theoretical nanoscale technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology within the scope of the journal. ETN aims to acquire the recent and outstanding researches for the benefit of the human being.
Ultra-thin crystalline films of Bi-based chalcogenides were deposited with the aid of vacuum thermal evaporation technique. The influence of thermal annealing on the optical properties of Bi2Te3-Bi2Se3 films with different thicknesses has been investigate. Optical transmittance and reflectance of the as prepared and annealed films were measured in the wavelength range 290–2700 nm using a double beam spectrophotometer. Fundamental optical properties such as absorption coefficient and energy bend gap were derived based on the measured spectra and film’s thickness. We demonstrate in the present work that the synergy of annealing and thickness reduction can be exploited for light transmittance enhancements, and consequently optoelectronic applications including transparent electrode can be achieved.
Keywords: Thin films; Chalcogenides; Optical transmission; Band gap.