1985 Volume 1985 Issue 6 Pages 1154-1159
The heterojunction of CuO/ZnO is prepared by the chemical vapor deposition of ZnO on a CuO pellet or by contacting both sintered pellets by mechanical pressure and the currentvoltage characteristics (I-V characteristics) of heterojunctions are investigated. Only the mechanically contacted junction showed humidity-sensitive I-V characteristics. As the humidity increases, the current flow across the junction in forward bias increases markedly, resulting in highly rectifying character (Fig.2). This rectifying I-V characteristics is also observed when measured in distilled water (Fig.4). Therefore, it is assumed that the increase of the current in forward bias under high humidity is due to ionic conduction through physisorbed water at the interface of the junction. When the I-V Characteristics of the mechanically contacted junction were measured in various liquids, different I-V characteristics were observed, depending on the kind of liquids. The result suggests possibile application of this junction as a liquid-leakage sensor. However, metallic cupper was deposited on the ZnO surface after the application of high d. c. bias, resulting in considerable change in the I-V chracteristics (Fig.8).
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