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Dielectric constant, AC conductivity and impedance spectroscopy of zinc-containing diamond-like carbon film UV photodetector

Das, A. K. and Hatada, R. and Ensinger, W. and Flege, S. and Baba, K. and Meikap, A. K. (2018):
Dielectric constant, AC conductivity and impedance spectroscopy of zinc-containing diamond-like carbon film UV photodetector.
In: Journal of Alloys and Compounds, Elsevier Science Publishing, pp. 194-205, 758, ISSN 09258388,
DOI: 10.1016/j.jallcom.2018.05.121,
[Online-Edition: https://doi.org/10.1016/j.jallcom.2018.05.121],
[Article]

Abstract

We report on the dielectric constant, conductivity, impedance spectroscopy and current-voltage characteristic of zinc contain diamond-like carbon (Zn-DLC) films prepared by a combination of plasma source ion implantation with magnetron sputtering of a zinc target. The frequency variation of the AC conductivity follows Jonscher's power law. The temperature variation of the frequency exponent indicates that the charge carriers follow a correlated barrier hopping conduction mechanism. The frequency dispersion of real and imaginary part of the dielectric constant obeys a modified Cole-Cole equation. The space charge conductivity, free charge conductivity and relaxation time of the Zn-DLC thin films are temperature dependent. The relaxation time decreases with increase in temperature. The Nyquist plot of complex impedance spectroscopy is simulated by a simple electrical equivalent circuit. The imaginary part of the complex impedance shows a relaxation peak, which shifts towards the high frequency side with an increase in temperature. The temperature dependent current-voltage (I-V) characteristic shows a non-linear type behaviour which follows the Poole-Frenkel (PF) emission model. To investigate the photosensitivity of an Ag/Zn-DLC/Si device, we placed it in dark and UV light condition and measured the (I-V) characteristic at room temperature. The dark current density and photocurrent density follow the PF model and a modified PF model respectively.

Item Type: Article
Erschienen: 2018
Creators: Das, A. K. and Hatada, R. and Ensinger, W. and Flege, S. and Baba, K. and Meikap, A. K.
Title: Dielectric constant, AC conductivity and impedance spectroscopy of zinc-containing diamond-like carbon film UV photodetector
Language: English
Abstract:

We report on the dielectric constant, conductivity, impedance spectroscopy and current-voltage characteristic of zinc contain diamond-like carbon (Zn-DLC) films prepared by a combination of plasma source ion implantation with magnetron sputtering of a zinc target. The frequency variation of the AC conductivity follows Jonscher's power law. The temperature variation of the frequency exponent indicates that the charge carriers follow a correlated barrier hopping conduction mechanism. The frequency dispersion of real and imaginary part of the dielectric constant obeys a modified Cole-Cole equation. The space charge conductivity, free charge conductivity and relaxation time of the Zn-DLC thin films are temperature dependent. The relaxation time decreases with increase in temperature. The Nyquist plot of complex impedance spectroscopy is simulated by a simple electrical equivalent circuit. The imaginary part of the complex impedance shows a relaxation peak, which shifts towards the high frequency side with an increase in temperature. The temperature dependent current-voltage (I-V) characteristic shows a non-linear type behaviour which follows the Poole-Frenkel (PF) emission model. To investigate the photosensitivity of an Ag/Zn-DLC/Si device, we placed it in dark and UV light condition and measured the (I-V) characteristic at room temperature. The dark current density and photocurrent density follow the PF model and a modified PF model respectively.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 758
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Amorphous material, Dielectric response, Electrical transport, Photosensitivity
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 27 Jun 2018 09:38
DOI: 10.1016/j.jallcom.2018.05.121
Official URL: https://doi.org/10.1016/j.jallcom.2018.05.121
Funders: The authors (A. K. Das and A. K. Meikap) are gratefully acknowledge DST (Project no. EMR/2016/001409) & DAE-BRNS (No. 34/14/7/2014-BRNS/0140), Govt. of India for their financial support during this work.
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