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Chin. Phys. B, 2017, Vol. 26(2): 028102    DOI: 10.1088/1674-1056/26/2/028102
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Electrical and dielectric characterization of Au/ZnO/n—Si device depending frequency and voltage

I Orak1,2, A Kocyigit3, Ş Alındal4
1 Bingöl University, Vocational School of Health Services, 12000 Bingöl, Turkey;
2 Bingöl University, Faculty of Sciences and Arts, Department of Physics, 12000 Bingöl, Turkey;
3 Igdir University, Engineering Faculty, Department of Electrical Electronic Engineering, 76000 Igdir, Turkey;
4 Gazi Universty, Faculty of Sciences, Department of Physics, 06500, Ankara, Turkey
Abstract  Au/ZnO/n-type Si device is obtained using atomic layer deposition (ALD) for ZnO layer, and some main electrical parameters are investigated, such as surface/interface state (Nss), barrier height (Φb), series resistance (Rs), donor concentration (Nd), and dielectric characterization depending on frequency or voltage. These parameters are acquired by use of impedance spectroscopy measurements at frequencies ranging from 10 kHz to 1 MHz and the direct current (DC) bias voltages in a range from -2 V to +2 V at room temperature are used. The main electrical parameters and dielectric parameters, such as dielectric constant (ε"), dielectric loss (ε"), loss tangent (tan δ), the real and imaginary parts of electric modulus (M' and M"), and alternating current (AC) electrical conductivity (σ) are affected by changing voltage and frequency. The characterizations show that some main electrical parameters usually decrease with increasing frequency because charge carriers at surface states have not enough time to fallow an external AC signal at high frequencies, and all dielectric parameters strongly depend on the voltage and frequency especially in the depletion and accumulation regions. Consequently, it can be concluded that interfacial polarization and interface charges can easily follow AC signal at low frequencies.
Keywords:  Au/ZnO/n-Si device      dielectric properties      polarization process      frequency and voltage dependence     
Received:  20 September 2016      Published:  05 February 2017
PACS:  81.05.Dz (II-VI semiconductors)  
  85.30.-z (Semiconductor devices)  
  85.30.Hi (Surface barrier, boundary, and point contact devices)  
  85.30.Kk (Junction diodes)  
Corresponding Authors:  A Kocyigit     E-mail:  adem.kocyigit@igdir.edu.tr

Cite this article: 

I Orak, A Kocyigit, Ş Alındal Electrical and dielectric characterization of Au/ZnO/n—Si device depending frequency and voltage 2017 Chin. Phys. B 26 028102

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