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The electrical properties of La2CuO4/ZnO heterocontacts at different relative humidities

Published online by Cambridge University Press:  03 March 2011

Enrico Traversa ,
Andrea Bearzotti ,
Masaru Miyayama  and
Hiroaki Yanagida
Enrico Traversa
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, Univesita' di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
Andrea Bearzotti
Affiliation:
Istituto di Elettronica dello Stato Solido (IESS), C.N.R., Via Cineto Romano 42, 00156 Roma, Italy
Masaru Miyayama
Affiliation:
Research Center for Advanced Science and Technology (RCAST), University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153. Japan
Hiroaki Yanagida
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan
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Abstract

The humidity-sensing electrical properties of heterocontacts between p-type La2CuO4 and n-type ZnO semiconductors, and of the single oxides, as a comparison, were studied. The heterocontacts was prepared by mechanically pressing sintered disks of the two oxides. The electrical characterization of the heterocontacts was carried out using dc and ac measurements at various relative humidity (RH) values, in order to evaluate the sensing mechanisms and the electrical properties of these p-n junctions. Their humidity sensitivity was explained in terms of the variation of the barrier height at the p-n junctions, due to the saturation of the original interface states by physisorbed water, which leads to the release of trapped electrons, resulting in an increase in the forward current. The higher the number of interface states, the higher the RH-sensitivity of the heterocontacts. Electrochemical impedance spectroscopy (EIS) measurements showed, at 90% RH, a distribution of capacitances with different relaxation times, which may be caused by the electrolysis of water molecules at p-n junction sites. For their use as humidity sensors, they showed a response of 4 orders of magnitude in the whole RH range tested, and a fast response time. The response of the heterocontacts was bias-dependent, tunable by externally applied electric field. They also have stand-by capability and a self-cleaning mechanism, which allow them to be described as intelligent materials.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 9 , September 1995 , pp. 2286 - 2294
Copyright
Copyright © Materials Research Society 1995

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