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Proceedings Paper

ZnMgO solar blind detectors: from material to systems
Author(s): Mehdi F. Anwar; Abdiel Rivera; Anas Mazady; Hung Chi Chou; John W. Zeller; Ashok K. Sood
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Paper Abstract

Zinc oxide (ZnO) is a unique wide bandgap biocompatible material system exhibiting both semiconducting and piezoelectric properties that has a diverse group of growth morphologies. Bulk ZnO has a bandgap of 3.37 eV that corresponds to emissions in the ultraviolet (UV) spectral band. Highly ordered vertical arrays of ZnO nanowires (NWs) have been grown on substrates including silicon, SiO2, GaN, and sapphire using a metal organic chemical vapor deposition (MOCVD) growth process. The structural and optical properties of the grown vertically aligned ZnO NW arrays were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) measurements. Compared to conventional UV sensors, detectors based on ZnO NWs offer high UV sensitivity and low visible sensitivity, and are expected to exhibit low noise, high quantum efficiency, extended lifetimes, and have low power requirements. The photoresponse switching properties of NW array based sensing devices have been measured with intermittent exposure to UV radiation, where the devices were found to switch between low and high conductivity states at time intervals on the order of a few seconds. Envisioned applications for such sensors/FPAs potentially include threat detection and threat warning.

Paper Details

Date Published: 19 September 2013
PDF: 8 pages
Proc. SPIE 8868, Infrared Sensors, Devices, and Applications III, 88680B (19 September 2013); doi: 10.1117/12.2032204
Show Author Affiliations
Mehdi F. Anwar, Univ. of Connecticut (United States)
Abdiel Rivera, Univ. of Connecticut (United States)
Anas Mazady, Univ. of Connecticut (United States)
Hung Chi Chou, Univ. of Connecticut (United States)
John W. Zeller, Magnolia Optical Technologies, Inc. (United States)
Ashok K. Sood, Magnolia Optical Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 8868:
Infrared Sensors, Devices, and Applications III
Paul D. LeVan; Ashok K. Sood; Priyalal S. Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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