Impacts of thickness reduction and heat treatment on the optical properties of thin chalcogenide films |
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Affiliation: | 1. Department of Physics, Materials Physics and Energy Laboratory, College of Science and Arts at ArRass - Qassim University, Ar Rass 51921, Saudi Arabia;2. Electron Microscope and Thin Films Department, Physics Division, National Research Centre, Dokki, Giza 12622, Egypt;3. Department of Physics, Faculty of Education, Nanoscience & Semiconductor Laboratories, Ain Shams University, Cairo, Egypt |
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Abstract: | Bi-based chalcogenides, in the form of thin crystalline films, were deposited at different thicknesses onto highly cleaned glass slides with the aid of vacuum thermal evaporation technique. The influence of thermal annealing on the optical properties of Bi2Te3-Bi2Se3 films at different thicknesses is investigated in this work. Wavelength dependence of the optical transmittance and reflectance was recorded, for the as-prepared and the annealed films, in the wavelength range from 350 to 2700 nm using a double beam spectrophotometer. Fundamental optical properties such as absorption coefficient and energy band 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 for optoelectronic applications including transparent conductive electrodes. |
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Keywords: | Thin films Chalcogenides Annealing Optical transmission Band gap |
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