Understanding the conductive channel evolution in Na:WO(3-x)-based planar devices

Nanoscale
Dashan ShangMatthias Wuttig

Abstract

An ion migration process in a solid electrolyte is important for ion-based functional devices, such as fuel cells, batteries, electrochromics, gas sensors, and resistive switching systems. In this study, a planar sandwich structure is prepared by depositing tungsten oxide (WO(3-x)) films on a soda-lime glass substrate, from which Na(+) diffuses into the WO(3-x) films during the deposition. The entire process of Na(+) migration driven by an alternating electric field is visualized in the Na-doped WO(3-x) films in the form of conductive channel by in situ optical imaging combined with infrared spectroscopy and near-field imaging techniques. A reversible change of geometry between a parabolic and a bar channel is observed with the resistance change of the devices. The peculiar channel evolution is interpreted by a thermal-stress-induced mechanical deformation of the films and an asymmetric Na(+) mobility between the parabolic and the bar channels. These results exemplify a typical ion migration process driven by an alternating electric field in a solid electrolyte with a low ion mobility and are expected to be beneficial to improve the controllability of the ion migration in ion-based functional devices, such as resistive switchin...Continue Reading

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Citations

Dec 22, 2015·Physical Chemistry Chemical Physics : PCCP·Zheng-Hua TanXin Guo
Mar 22, 2016·Physical Chemistry Chemical Physics : PCCP·Chuan-Sen YangYoung Sun
Nov 18, 2016·Physical Chemistry Chemical Physics : PCCP·Chuan-Sen YangYoung Sun

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