Investigation of dielectric relaxation and ac electrical conductivity using impedance spectroscopy method in (AuZn)/TiO2/p-GaAs(110) schottky barrier diodes

The low-frequency impedance spectroscopy method has been used to investigate the electrical conductivity peculiarities of lithium niobate (LN) crystals reduced in hydrogen. It has been found that the activation energy value of the dark electrical conductivity of such crystals in a temperature range of 288...370 К is equal to 0.68±0.02 eV. It has been demonstrated that the multiple heating of «black» LN crystals up to a temperature of about 420 K results in surface layers with modified electrical properties to occur in the crystal’s polar faces. The electrical conductivity mechanism of LiNbO3 crystals reduced in the hydrogen-containing atmosphere, and the causes of the instability of these properties are discussed.

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Dielectric Relaxation Behavior and AC Electrical Conductivity Study of 2-(1,2-Dihydro-7-Methyl-2-Oxoquinoline-5-yl) Malononitrile (DMOQMN)

Journal of Electronic Materials ◽

10.1007/s11664-016-5005-4 ◽

2016 ◽

Vol 46 (2) ◽

pp. 1093-1099 ◽

Cited By ~ 14

Author(s):

M. M. El-Nahass ◽

E. F. M. El-Zaidia ◽

A. A. A. Darwish ◽

G. F. Salem

Keyword(s):

Electrical Conductivity ◽

Dielectric Relaxation ◽

Relaxation Behavior ◽

Ac Electrical Conductivity ◽

Electrical Conductivity Study ◽

Dielectric Relaxation Behavior

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Dielectric properties and electric modulus of Au/PPy/n-Si (MPS) type Schottky barrier diodes (SBDS) as a function of frequency and applied bias voltage

International Journal of Modern Physics B ◽

10.1142/s0217979215500757 ◽

2015 ◽

Vol 29 (13) ◽

pp. 1550075 ◽

Cited By ~ 14

Author(s):

İbrahim Yücedağ ◽

Gülçin Ersöz ◽

Ahmet Gümüş ◽

Şemsettin Altındal

Keyword(s):

Schottky Barrier ◽

Bias Voltage ◽

Surface States ◽

Organic Layer ◽

Schottky Barrier Diodes ◽

Applied Bias Voltage ◽

Ac Electrical Conductivity ◽

Zero Bias ◽

Peak Intensity ◽

Tan Δ

Au/PPy/n-Si Schottky barrier diodes (SBDs) were fabricated by forming polypyrrole (PPy) organic layer on n-Si using the spin coating technique. Frequency-dependent dielectric constant (ε′), dielectric loss (ε″), loss tangent ( tan δ), real and imaginary parts of electrical modulus (M′ and M″) and AC electrical conductivity (σ ac ) parameters of the structure were investigated in the frequency range of 10–500 kHz. It was found that the values of the ε′, ε″ and tan δ, in general, decrease with increasing frequency while an increase is observed in σ ac , M′ and M″. The tan δ and M″ also exhibit a peak at about zero-bias voltage, while peak intensity weakens with increasing frequency. The values of ε′ and M′ decrease with increasing voltage while an increase is observed in ε″, tan δ, σ ac and M″. These changes in ε′, ε″, tan δ, M′, M″ and σ ac values was attributed to surface charge polarization and the particular density distribution of surface states localized at PPy/n-Si interface.

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