Electro-physical characterization of individual and arrays of ZnO nanowires

Capacitance measurements were made on an array of parallel ZnO nanowires embedded in a polymer matrix and provided with two electrodes perpendicular to the nanowires. The capacitance monotonically increased, and saturated at large negative (depleting) and large positive (accumulating) voltages. A qu...

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Veröffentlicht in:Journal of applied physics 2015-07, Vol.118 (3)
Hauptverfasser: Mallampati, Bhargav, Singh, Abhay, Shik, Alex, Ruda, Harry E., Philipose, U.
Format: Artikel
Sprache:eng
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Zusammenfassung:Capacitance measurements were made on an array of parallel ZnO nanowires embedded in a polymer matrix and provided with two electrodes perpendicular to the nanowires. The capacitance monotonically increased, and saturated at large negative (depleting) and large positive (accumulating) voltages. A qualitative explanation for this behavior is presented, taking into account specific features of quasi-one-dimensional screening. The increasing or decreasing character of the capacitance-voltage characteristics were determined by the conductivity type of the nanowires, which in our case was n-type. A dispersion of the experimental capacitance was observed over the entire frequency range of 1 kHz to 5 MHz. This phenomenon is explained by the slow discharge of the nanowires through the thin dielectric layer that separates them from the top electrode. Separate measurements on individual identical nanowires in a field effect transistor configuration yielded an electron concentration and mobility of approximately 1017 cm−3 and 150 cm2/Vs, respectively, at room temperature.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4926793