Das, A. K. ; Hatada, R. ; Ensinger, W. ; Flege, S. ; Baba, K. ; 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, 758
doi: 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. ; Hatada, R. ; Ensinger, W. ; Flege, S. ; Baba, K. ; Meikap, A. K. |
| Type of entry: | Bibliographie |
| Title: | Dielectric constant, AC conductivity and impedance spectroscopy of zinc-containing diamond-like carbon film UV photodetector |
| Language: | English |
| Date: | 25 August 2018 |
| Publisher: | Elsevier Science Publishing |
| Journal or Publication Title: | Journal of Alloys and Compounds |
| Volume of the journal: | 758 |
| DOI: | 10.1016/j.jallcom.2018.05.121 |
| URL / URN: | https://doi.org/10.1016/j.jallcom.2018.05.121 |
| 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. |
| 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 |
| Last Modified: | 04 Jan 2019 10:26 |
| PPN: | |
| 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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