Frequency-Dependent Admittance Analysis of Au/n-Si Structure with CoSO4-PVP Interfacial Layer


Tascioglu I., SEVGİLİ Ö., Azizian-Kalandaragh Y., ALTINDAL Ş.

Journal of Electronic Materials, vol.49, no.6, pp.3720-3727, 2020 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49 Issue: 6
  • Publication Date: 2020
  • Doi Number: 10.1007/s11664-020-08091-0
  • Journal Name: Journal of Electronic Materials
  • Journal Indexes: Science Citation Index Expanded, Scopus, PASCAL, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, INSPEC
  • Page Numbers: pp.3720-3727
  • Keywords: CoSO4-PVP film, electrical and dielectric properties, interfacial polarization, AC conductivity, impedance spectroscopy, CURRENT-TRANSPORT MECHANISMS, DIELECTRIC-PROPERTIES, ELECTRICAL-CONDUCTIVITY, SCHOTTKY DIODES, TEMPERATURE, MODULUS, SPECTROSCOPY, RELAXATION

Abstract

© 2020, The Minerals, Metals & Materials Society.A film of cobalt sulfate (CoSO4)-doped polyvinylpyrrolidone (PVP) blend was spin-coated on n-Si. Electrical measurements were conducted on the Au/n-Si structure with the CoSO4-PVP film sandwiched between them. The frequency dispersion of the main electrical and dielectric parameters and the corresponding mechanisms were evaluated. The extra capacitance originating from the contribution of interface states (Nss) resulted in a fairly large frequency dispersion in C–V plots. These states also influence the carrier transport and conduction mechanism, thus the determination of real Nss values is crucial to evaluate the nonideal behavior of such plots. The values of Nss were calculated using the Hill–Coleman method. The dielectric constant (ε′) and dielectric loss (ε″) exhibited higher values in the low-frequency region as a result of interface and dipole polarization, while the alternating-current (AC) electrical conductivity (σac) generally decreased. The variation of the loss tangent with increasing frequency of the applied field confirmed the effect of some internal field within the CoSO4-PVP film accompanied by the external AC field.