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      https://www.ias.ac.in/article/fulltext/boms/044/0150

    • Keywords

       

      Thin film; capacitance; energy density; power density; Zisman method.

    • Abstract

       

      In this study, BiTe thin films are grown on glass substrates by chemical bath deposition method, at different pH levels. Crystallographic structures, crystal dimensions, dislocation densities and crystallization numbers of thin films are characterized by X-ray diffraction, whereas surface morphologies, roughness and film thicknesses are characterized by scanning electronic microscopy and atomic force microscopy. Surface tensions are calculated by Zisman method using different liquids. Capacitance, energy and power densities are calculated for each pH level by using time-dependent current–voltage measurements. Monocrystalline thin films of Bi$_2$Te$_3$ are observed at pH 3 and Bi$_4$Te$_5$ at pH 11, whereas polycrystalline Bi$_2$Te$_3$ and Bi$_4$Te$_5$ structures are formed at pH 7 and 9, respectively. Surface roughness and film thicknesses of polycrystalline thin films are found to be significantly higher than monocrystalline thin films. Capacitance,energy and power density of BiTe thin films produced at pH 3, 7, 9 and 11 are calculated as 503, 562, 569 and 512 F g$^{-1}$;55.19, 61.66, 62.43 and 56.17 Wh kg$^{-1}$; and 3311.4, 3699.6, 3745.8 and 3370.2 W kg$^{-1}$, respectively. These results show that capacitance, energy and power density of polycrystalline thin films produced at pH 7 and 9, which have high surfaceload activity, are higher. Electrical resistivity of Bi$_2$Te$_3$ and Bi$_4$Te$_5$ monocrystalline films are lower than those of the polycrystalline BiTe films.

    • Author Affiliations

       

      NECMI SERKAN TEZEL1 FATMA MEYDANERI TEZEL2 ISHAK AFŞIN KARIPER3 4

      1. Department of Electrical-Electronics Engineering, Faculty of Engineering, Karabük University, 78050 Karabük, Turkey
      2. Department of Metallurgy and Materials Engineering, Faculty of Engineering, Karabük University, 78050 Karabük, Turkey
      3. Department of Science Educations, Faculty of Education, Erciyes University, 38039 Kayseri, Turkey
      4. Erciyes Teknopark, 38039 Kayseri, Turkey
    • Dates

       
  • Bulletin of Materials Science | News

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