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Electronics 2016, 5(2), 23; doi:10.3390/electronics5020023

Frequency Dependence of Electrical Parameters of an Organic-Inorganic Hybrid Composite Based Humidity Sensor

Department of Electrical Engineering, College of Engineering, Qassim University, P.O. Box 6677, Qassim 51452, Saudi Arabia
Academic Editor: Thomas Riedl
Received: 11 February 2016 / Revised: 2 May 2016 / Accepted: 12 May 2016 / Published: 23 May 2016
View Full-Text   |   Download PDF [1046 KB, uploaded 23 May 2016]   |  

Abstract

The present study highlights the interdependence of ambient humidity levels on the electrical parameters of organic-inorganic hybrid composite based humidity sensor at varied AC frequencies of input signal. Starting from the bottom, the layer stack of the fabricated humidity sensor was 200-nm silver (Ag) thin film and 4 μm spun-coated PEPC+NiPC+Cu2O active layer. Silver thin films were deposited by thermal evaporator on well cleaned microscopic glass slides, which served as a substrate. Conventional optical lithography procedure was adapted to define pairs of silver-silver surface electrodes with two sorts of configurations, i.e., interdigitated and rectangular. Humidity-sensitive layers of organic-inorganic composite were then spun-cast upon the channel between the silver electrodes. The changes in relative humidity levels induced variation in capacitance and impedance of the sensors. These variations in electrical parameters of sensors were also found to be highly dependent upon frequency of input AC signal. Our findings reveal that the organic-inorganic composite shows higher humidity sensitivity at smaller orders of frequency. This finding is in accordance with the established fact that organic semiconductors-based devices are not applicable for high frequency applications due to their lower charge carrier mobility values. Two distinct geometries of semiconducting medium between the silver electrodes were investigated to optimize the sensing parameters of the humidity sensor. Furthermore, the effect of temperature change on the resistance of organic composite has also been studied. View Full-Text
Keywords: organic-inorganic hybrid composite; photolithography; dielectric medium; polarizability; multi frequency impedance spectrum organic-inorganic hybrid composite; photolithography; dielectric medium; polarizability; multi frequency impedance spectrum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Akram, R. Frequency Dependence of Electrical Parameters of an Organic-Inorganic Hybrid Composite Based Humidity Sensor. Electronics 2016, 5, 23.

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