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      https://www.ias.ac.in/article/fulltext/boms/042/05/0225

    • Keywords

       

      Ag/Ru$_{0.03}$–PVA/$n$-Si; impedance spectroscopy; frequency dependence; surface states.

    • Abstract

       

      Ag/Ru$_{0.03}$−PVA/$n$-Si structures were successfully prepared and their morphological and electrical properties were investigated. The obtained electrical results suggested that the complex dielectric constant ($\epsilon^* = \epsilon^{\prime} − j\epsilon^{\prime\prime}$), complex electric modulus $M^∗ = M^{\prime} + jM^{\prime\prime}$, loss tangent ($\tan \delta$) and alternating current (ac) electrical conductivity ($\sigma_{\rm ac}$) are all a strong function of the frequency ($f$) and applied voltage. The changes in these parameters are the results of the existence of the surface states ($N_{\rm ss}$) or interface traps ($D_{\rm it} = N_{\rm ss}$), interfacial polymer layer, surface and dipole polarizations and hopping mechanisms. The values of $\epsilon^{\prime}$ and $\epsilon^{\prime\prime}$ show a steep decline with increasing frequency and then reach a constant value at high frequency, whereas the increments of $M^{\prime}$ and $M^{\prime\prime}$ with frequency are exponential. The $\tan \delta$ vs. $\log f$ plot has a strong peak behaviour, especially in the accumulation region. These experimental results suggested that the Ru$_{0.03}$−PVA interfacial layer could be used as a high dielectric material instead of conventional materials.

    • Author Affiliations

       

      YOSEF BADALI1 SERHAT KOÇYIGIT1 IBRAHIM USLU2 SEMSETTIN ALTINDAL3

      1. Department of Advanced Technologies, Institute of Science and Technology, Gazi University, Ankara 06500, Turkey
      2. Department of Chemistry Education, Faculty of Education, Gazi University, Ankara 06500, Turkey
      3. Department of Physics, Faculty of Science, Gazi University, Ankara 06500, Turkey
    • Dates

       
  • Bulletin of Materials Science | News

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