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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/046/0011

    • Keywords

       

      Fe-doped Bi$_2$Te$_3$ thin films; structural characteristics; electrical properties; optical properties.

    • Abstract

       

      In this work, the structural, morphological, electrical and optical properties of Bi$_{2–x}$Te$_3$Fe$_x$ (x = 0, 0.3 and 0.5 at%) thin films were investigated. X-ray diffraction investigations revealed the formation of hexagonal Bi$_2$Te$_3$ structure for undoped and Fe-doped films. Scanning electron microscopy observations revealed an increase in the average grain size from 20.4 to 43.5 nm with increasing Fe doping ratio from 0 to 0.5 at%. A transition from N-type conduction to P-type conduction with a decrease in carrier concentration was observed after Fe doping with 0.3 at%. Energy-dispersive X-ray spectroscopy spectra confirmed the presence of Fe in the doped films. The optical absorbance (Abs), transmittance (T%) and reflectance (R%) spectra of Bi$_{2–x}$Te$_3$Fe$_x$ films were measured in the spectral range from 200 to 2500 nm. Both T% and R% were strongly affected by Fe doping. The optical bandgap decreased from 0.26 to 0.17 eV with increasing Fe ratio from 0 to 0.5 at%. Over most of the studied wavelength range, the refractive index values increased with increasing Fe doping ratio. The optical conductivity values were mainly increased with Fe doping. The examined optical and electrical properties of Bi$_{2–x}$Te$_3$Fe$_x$ (x = 0, 0.3 and 0.5 at%) thin films may enable rapid material selection for designing certain applications such as optical coatings.

    • Author Affiliations

       

      MOHAMMED S ALQAHTANI1 N M A HADIA2 3 H MOHAMED3 M A AWAD3

      1. Department of Physics and Astronomy, King Saud University, Riyadh 11451, Saudi Arabia
      2. Department of Physics, College of Science, Jouf University, Sakaka 2014, Saudi Arabia
      3. Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt

    • Dates

       
      Published
      17 January 2023
      Manuscript received
      27 June 2022
      Accepted
      10 September 2022
      Final version published online
      17 January 2023

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