Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 628, Issue -, Pages 442-449Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.12.170
Keywords
TiO2/GaAs(110); X-ray diffraction; Secondary ion mass spectroscopy; Atomic force microscope; Frequency and voltage dependence; Dielectric relaxation; Electric modulus
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Dielectric properties and ac electrical conductivity of (AuZn)/TiO2/p-GaAs(110) Schottky barrier diodes (SBDs) were investigated by using impedance spectroscopy method (capacitance and conductance measurements) in a wide frequency and applied bias voltage ranges at room temperature. The values of dielectric constant (epsilon'), dielectric loss (epsilon), dielectric loss tangent (tan delta), real and imaginary parts of electrical modulus (M' and M) and ac electrical conductivity (sigma(ac)) were found considerably sensitive to frequency and applied bias voltage especially in depletion and accumulation regions. While the values of e, e and tand decrease, M' and M increase with increasing frequencies due to the effect of interface states/traps (N-ss), interfacial and dipole polarizations, series resistance (R-s) and interfacial layer. Changes in these parameters are considerably high at low frequencies and they confirmed that the interfacial and dipole polarizations can occur more easily at low frequencies. Majority of the charges at N-ss between (TiO2/p-GaAs) can also easily follow external ac signal and so contributes to deviation of dielectric properties of the (AuZn)/TiO2/p-GaAs(110) SBDs. In addition, structural properties of the sample such as crystallographic quality and interface characteristics were analyzed by X-ray Diffraction (XRD) and Secondary Ion Mass Spectrometry (SIMS) measurements. Surface morphology of the sample was characterized by atomic force microscopy (AFM) measurements. Surface RMS roughness values of the sample is obtained as 8.94 nm over a scan area of 3 mu m x 3 mu m. (C) 2015 Elsevier B.V. All rights reserved.
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