Institute of Physics Ministry of Science and Education Republic of Azerbaijan

EFFECT OF 7% Ni DOPING IN PVP INTERLAYER ON THE FREQUENCY-DEPENDENT ELECTRICAL PROPERTIES OF Au/n-Si SCHOTTKY DIODES UNDER LOW-FREQUENCY CONDITIONS

E.R. Bakhtiyarli, I.M. Afandiyeva

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ABSTRACT

In this study, we investigate the electrical properties of a Au/7%Ni-doped PVP/n-Si metal–polymer–semiconductor (MPS) structure. The study focuses on the influence of the Ni-doped interfacial polymer layer on the device’s low-frequency behavior. Electrical characterization was carried out using capacitance–voltage (C–V), conductance over angular frequency–voltage (G/ω–V), and series resistance–voltage (Rs–V) measurements. All measurements were performed at room temperature (300 K), in the voltage range from –4.5 V to +3.5 V, using two low-frequency conditions: 100 Hz and 200 Hz. A pronounced frequency-dependent dispersion was observed in both C–V and G/ω–V characteristics, particularly near +1.2 V, indicating strong interfacial polarization and trap-related effects. The peak capacitance at 100 Hz reached approximately 9.4 × 10⁻¹⁰ F, decreasing at higher frequency due to the reduced response of surface states. Series resistance, extracted using the Nicollian–Brews method, showed significant variation with both voltage and frequency, confirming the active role of interfacial traps and dipolar relaxation in the Ni-doped PVP layer. These findings demonstrate that Ni incorporation substantially modifies the dielectric and resistive properties of the interface, enhancing the sensitivity of the device to frequency-dependent surface state dynamics.

Keywords: Metal–Polymer–Semiconductor (MPS), Ni-doped PVP, Schottky diode, Capacitance–Voltage (C–V), Conductance–Voltage (G/ω–V), impedance spectroscopy, Interface states.
DOI:10.70784/azip.1.2026132

Received: 16.02.2026
Internet publishing: 19.02.2026 AJP Fizika E 2026 1 en p.32-37

AUTHORS & AFFILIATIONS

Baku State University, Department of Physics, Baku,Azerbaijan
E-mail: elvinb18104@sabah.edu.az, I_afandiyeva@yahoo.com

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