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<p>This research examines the impacts of a pure polymer or nanocomposite interlayer and its frequency dependency on dielectric properties, including complex dielectric constant (e*), electric modulus(M*), impedance(Z*), and AC conductivity(s<sub>ac</sub>). To this end, three Schottky barrier diodes (SBDs) with Au/n-Si (D<sub>0</sub>), Au/PVC/n-Si (D<sub>1</sub>), and Au/PVC: Cr/n-Si (D<sub>2</sub>) configurations were produced by using n-type silicon. This paper presents a detailed account of the synthesis of PVC: Cr composite and the fabrication of SBDs. The surface morphology of the PVC polymer and Cr nanostructures was systematically analyzed using field emission scanning electron microscopy (FE-SEM), yielding critical insights into the material’s structural characteristics. To determine these parameters, the variation of C/(G/ω) with frequency (f) was measured at room temperature across a wide frequency range of 100&#xa0;Hz-1&#xa0;MHz for each of the three diodes. The dielectric constant at 100&#xa0;Hz was significantly enhanced from 3.9 (D<sub>0</sub>) to 32 (D<sub>1</sub>) and 26 (D<sub>2</sub>). The frequency dependence of dielectric characteristics may be used to observe the frequency sensitivity of these properties, especially in the low-frequency region where surface polarization and interface states are dominant. The double-logarithmic σ<sub>ac</sub>-ω plot was utilized to examine the conduction mechanism. While at low frequencies connected to DC conductivity and the σ<sub>ac</sub> value is nearly frequency-independent, its slope value is lower than unity at large frequencies, implying a hopping mechanism. Furthermore, the conductivity and dielectric of the D<sub>1</sub> structure are greater than those of the D<sub>0</sub> structure due to the presence of the PVC interlayer. However, Cr nanoparticles (NPs) added to the polymer thin layer have decreased these structures’ capacitive/conductive features. Impedance and Nyquist analyses reveal that interfacial polarization, trap states, and charge carrier scattering significantly influence electrical behavior, particularly in the D<sub>1</sub> and D<sub>2</sub> configurations. These results underscore the importance of interlayer modifications in optimizing the performance of SBDs for advanced electronic applications. This suggests that various types of NPs may be added to the polymer layer to modify the dielectric properties for numerous electronic applications.</p>

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Impedance measurement to characterize dielectric response of Au-Si Schottky structure with PVC: cr interfaces

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • E. Yükseltürk

摘要

This research examines the impacts of a pure polymer or nanocomposite interlayer and its frequency dependency on dielectric properties, including complex dielectric constant (e*), electric modulus(M*), impedance(Z*), and AC conductivity(sac). To this end, three Schottky barrier diodes (SBDs) with Au/n-Si (D0), Au/PVC/n-Si (D1), and Au/PVC: Cr/n-Si (D2) configurations were produced by using n-type silicon. This paper presents a detailed account of the synthesis of PVC: Cr composite and the fabrication of SBDs. The surface morphology of the PVC polymer and Cr nanostructures was systematically analyzed using field emission scanning electron microscopy (FE-SEM), yielding critical insights into the material’s structural characteristics. To determine these parameters, the variation of C/(G/ω) with frequency (f) was measured at room temperature across a wide frequency range of 100 Hz-1 MHz for each of the three diodes. The dielectric constant at 100 Hz was significantly enhanced from 3.9 (D0) to 32 (D1) and 26 (D2). The frequency dependence of dielectric characteristics may be used to observe the frequency sensitivity of these properties, especially in the low-frequency region where surface polarization and interface states are dominant. The double-logarithmic σac-ω plot was utilized to examine the conduction mechanism. While at low frequencies connected to DC conductivity and the σac value is nearly frequency-independent, its slope value is lower than unity at large frequencies, implying a hopping mechanism. Furthermore, the conductivity and dielectric of the D1 structure are greater than those of the D0 structure due to the presence of the PVC interlayer. However, Cr nanoparticles (NPs) added to the polymer thin layer have decreased these structures’ capacitive/conductive features. Impedance and Nyquist analyses reveal that interfacial polarization, trap states, and charge carrier scattering significantly influence electrical behavior, particularly in the D1 and D2 configurations. These results underscore the importance of interlayer modifications in optimizing the performance of SBDs for advanced electronic applications. This suggests that various types of NPs may be added to the polymer layer to modify the dielectric properties for numerous electronic applications.