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InN Based Water Condensation Sensors on Glass and Flexible Plastic Substrates
Honeywell Romania S.R.L, Sensors & Wireless Laboratory Bucharest, Calea Floreasca 169A, Building A, Bucharest 014459, Romania
National Institute of Materials Physics, Atomistilor 105 bis, Magurele 077125, Romania
Petroleum-Gas University of Ploiesti, Blvd. Bucuresti no 39, Ploieşti 100680, Romania
* Author to whom correspondence should be addressed.
Received: 30 September 2013; in revised form: 7 November 2013 / Accepted: 14 November 2013 / Published: 6 December 2013
Abstract: In this paper, we report the realization and characterization of a condensation sensor based on indium nitride (InN) layers deposited by magnetron sputtering on glass and flexible plastic substrates, having fast response and using potentially low cost fabrication technology. The InN devices work as open gate thin film sensitive transistors. Condensed water droplets, formed on the open gate region of the sensors, deplete the electron accumulation layer on the surface of InN film, thus decreasing the current of the sensor. The current increases back to its initial value when water droplets evaporate from the exposed InN film surface. The response time is as low as 2 s.
Keywords: III-nitride; indium nitride; condensation sensor; surface accumulation layer
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Dumitru, V.; Costea, S.; Brezeanu, M.; Stan, G.E.; Besleaga, C.; Galca, A.C.; Ionescu, G.; Ionescu, O. InN Based Water Condensation Sensors on Glass and Flexible Plastic Substrates. Sensors 2013, 13, 16940-16949.
Dumitru V, Costea S, Brezeanu M, Stan GE, Besleaga C, Galca AC, Ionescu G, Ionescu O. InN Based Water Condensation Sensors on Glass and Flexible Plastic Substrates. Sensors. 2013; 13(12):16940-16949.
Dumitru, Viorel; Costea, Stefan; Brezeanu, Mihai; Stan, George E.; Besleaga, Cristina; Galca, Aurelian C.; Ionescu, Gabriela; Ionescu, Octavian. 2013. "InN Based Water Condensation Sensors on Glass and Flexible Plastic Substrates." Sensors 13, no. 12: 16940-16949.