Aging-Dependent Electrical Properties in Polymer-Passivated ZnO Nanowire Field Effect Transistors

Aging-dependentelectricalpropertiesinpoly(methylmethacrylate)(PMMA)-passivatedZnOnanowirefieldeffecttransistors,whichshow an enhancement-mode behavior, were investigated. The electrical characteristics of the devices were systematically measuredand compared before and after storage in a vacuum desiccator for 8 months. The electrical properties of the aged devices, such asmobility, subthreshold swing, and carrier density, were greatly improved compared with those of the as-fabricated devices. This canbe attributed to desorption effects of adsorbed molecules on the nanowire surface in which the adsorbed molecules can transportthrough a PMMA passivation layer under vacuum.© The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative CommonsAttribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in anymedium, provided the original work is properly cited. [DOI: 10.1149/2.0081504ssl] All rights reserved.Manuscript submitted December 10, 2014; revised manuscript received February 9, 2015. Published February 18, 2015.