Enhancement of field-emission properties in ZnO nanowire array by post-annealing in H2 ambient

Title
Enhancement of field-emission properties in ZnO nanowire array by post-annealing in H2 ambient
Authors
박경수최영진안명원김동완성윤모박재관최경진
Keywords
nanowires; Post-annealing; Turn-on field; Field emission; Work function
Issue Date
2009-07
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 9, NO 7, 4328-4332
Abstract
We studied the effects of post-annealing in H2 and O2 ambients on field-emission properties of vertically-aligned ZnO nanowire arrays synthesized by carbothermal reduction process. The turn-on electric field was dramatically decreased from 3.78 to 2.37 V/ m after post-annealing in H2 ambient, which was explained by both hydrogen passivation effects of deep levels and surface modification. In other words, we could observe significant decrease of deep level peak in photoluminescence measurements on hydrogen post-annealed ZnO nanowire array. And also hydrogen-related bonds are strongly increased from X-ray photoelectron spectroscopy measurements. These findings suggest that the concentration of conduction electrons increased by hydrogen post-annealing, which results in the enhanced tunneling probability of conduction electrons into the vacuum.
URI
http://pubs.kist.re.kr/handle/201004/41288
ISSN
1533-4880
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KIST Publication > Article
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