Research Article

Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode

Volume: 16 Number: 4 September 23, 2026
TR EN

Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode

Abstract

The dielectric and impedance characteristics of an Al/CuPc/n-GaAs/In Schottky diode with a CuPc interfacial layer were investigated in detail. Capacitance–voltage (C–V) and conductance–voltage (G–V) measurements were performed in the frequency range of 10 kHz–1 MHz under bias voltages between −3 V and +5 V. Based on the C–V and G–V data, the voltage dependent dielectric parameters such as dielectric constant (ε′), dielectric loss (ε″), loss tangent (tanδ), electric modulus (M′ and M″), AC conductivity (σ_AC), and complex impedance components (Z′ and Z″) were evaluated. The results reveal a strong dependence of dielectric parameters on both frequency and applied bias voltage. High dielectric constant and dielectric loss values observed at low frequencies were attributed to interfacial polarization and interface state contributions at the CuPc/n-GaAs interface. The electric modulus analysis suggested the presence of non-Debye-type dielectric relaxation behavior. In addition, the AC conductivity results were found to be consistent with frequency-dependent transport involving localized charge carriers. The impedance response also indicated relaxation-related phenomena that may be influenced by the CuPc interfacial layer. These findings demonstrate that the CuPc interfacial layer plays a significant role in controlling dielectric relaxation and AC charge transport in GaAs-based Schottky structures.

Keywords

Schottky diode, Capacitance, Conductance, Dielectric properties, Ac conductivity, Impedance

Project Number

Selcuk Universitesi BAP Proje no: 25401082

References

  1. Akın, Ü., Yüksel, Ö.F., Tasci, E., Tugluoglu, N. (2020). Fabrication of a New Hybrid Coronene/n-Si Structure by Using Spin Coating Technique and its Photoresponse and Admittance Spectroscopy Studies. Silicon, 12, 1399-1405. https://doi.org/10.1007/s12633-019-00233-2
  2. Aldirmaz, E., Güler, M., Güler, E. (2023). Experimental investigations on the electrical and magnetic properties of a CuMn/p-Si-type Schottky diode. Journal of Materials Science-Materials in Electronics, 36, 1331. https://doi.org/10.1007/s10854-025-15427-1
  3. Bastug, A., Tasçioglu, I., Khalkhali, A., Altindal, S., Yildirim, M., Saritas, S. (2025). Exploring the dielectric and AC transport characteristics of Au/(Sn:Fe2O3)/n-Si diodes using impedance spectroscopy over extended frequency and voltage intervals. Journal of Materials Science-Materials in Electronics, 36, 1822. https://doi.org/10.1007/s10854-025-15906-5
  4. Berk, N., Turan, A., Karatas, S. (2025). Frequency and voltage dependent electrical and dielectric properties of Al/ p-Si semiconductor structures with GO interlayer. Physica B-Condensed Matter, 711, https://doi.org/417301. 10.1016/j.physb.2025.417301
  5. Çavdar, S., Oruç, P., Eymur, S., Tugluoglu, N. (2024). Frequency-dependent capacitance and conductance characteristics and current transport mechanisms of Schottky diodes with TPA-IFA organic interfacial layer. Physica Scripta, 99, 095986. https://doi.org/10.1088/1402-4896/ad6dab
  6. Das, E., Erdogan, M. (2026). A-D-A-type symmetric organic semiconductor for high performance self-powered photodiodes. Journal of Physics D-Applied Physics. 59, 025019. https://doi.org/10.1088/1361-6463/ae3093
  7. Demirezen, S., Yeriskin, S.A. (2021). Frequency and voltage-dependent dielectric spectroscopy characterization of Al/(Coumarin-PVA)/p-Si structures. Journal of Materials Science-Materials in Electronics, 32, 25339-25349. https://doi.org/10.1007/s10854-021-06993-1
  8. Dey, P., Chakraborty, N., Samanta, M., Das, B., Chattopadhyay, K.K. (2024). Strong light-matter interaction and non-linear effects in organic semiconducting CuPc nanotubes: realization of all-optical diode and switching applications. Physical Chemistry Chemical Physics, 26, 20112-20122. https://doi.org/10.1039/d4cp01852d
  9. Eymur, S., Aydemir, E.A., Yüksel, Ö.F.,Tugluoglu, N. (2026). Comprehensive frequency and voltage analysis of a BODIPY-based organic interlayer in Au/n-Si Schottky structures. Physica B-Condensed Matter, 727, 418360. https://doi.org/10.1016/j.physb.2026.418360
  10. Güçlü, C.S., Khalkhali, A., Hameed, S.A.,Tasçioglu, I., Demirci, A., Altindal, S. (2025). Dielectric response of Au/(Co:PVA)/n-Si/Al structures under varying frequencies and bias voltages. Journal of Materials Science-Materials in Electronics, 36, 1431. https://doi.org/10.1007/s10854-025-15485-5
APA
Kişnişci, Z. (2026). Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode. Karadeniz Fen Bilimleri Dergisi, 16(4), 1466-1485. https://doi.org/10.31466/kfbd.1909930
AMA
1.Kişnişci Z. Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode. KFBD. 2026;16(4):1466-1485. doi:10.31466/kfbd.1909930
Chicago
Kişnişci, Zeynep. 2026. “Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al CuPc N-GaAs In Schottky Diode”. Karadeniz Fen Bilimleri Dergisi 16 (4): 1466-85. https://doi.org/10.31466/kfbd.1909930.
EndNote
Kişnişci Z (September 1, 2026) Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode. Karadeniz Fen Bilimleri Dergisi 16 4 1466–1485.
IEEE
[1]Z. Kişnişci, “Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode”, KFBD, vol. 16, no. 4, pp. 1466–1485, Sept. 2026, doi: 10.31466/kfbd.1909930.
ISNAD
Kişnişci, Zeynep. “Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al CuPc N-GaAs In Schottky Diode”. Karadeniz Fen Bilimleri Dergisi 16/4 (September 1, 2026): 1466-1485. https://doi.org/10.31466/kfbd.1909930.
JAMA
1.Kişnişci Z. Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode. KFBD. 2026;16:1466–1485.
MLA
Kişnişci, Zeynep. “Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al CuPc N-GaAs In Schottky Diode”. Karadeniz Fen Bilimleri Dergisi, vol. 16, no. 4, Sept. 2026, pp. 1466-85, doi:10.31466/kfbd.1909930.
Vancouver
1.Zeynep Kişnişci. Frequency and Voltage Dependent AC Conductivity, Dielectric Properties and Impedance Characteristics of Al/CuPc/n-GaAs/In Schottky Diode. KFBD. 2026 Sep. 1;16(4):1466-85. doi:10.31466/kfbd.1909930