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Ultraviolet photodetector arrays assembled by dielectrophoresis of ZnO nanoparticles

Yan, Wenjing and Mechau, Norman and Hahn, Horst and Krupke, Ralph (2010):
Ultraviolet photodetector arrays assembled by dielectrophoresis of ZnO nanoparticles.
In: Nanotechnology, 21 (11), p. 115501, ISSN 0957-4484,
[Online-Edition: http://dx.doi.org/10.1088/0957-4484/21/11/115501],
[Article]

Abstract

Sensitive and fast ultraviolet sensor arrays have been produced by dielectrophoretic assembling of ZnO nanoparticles. The sub-micron device dimensions induce low operating voltage and low power consumption. The devices are long-term stable and operate in air, oxygen and nitrogen. We have determined the absorption and desorption dynamics from the time-resolved photoresponse and conclude that oxygen or carbon dioxide are the photodesorbed species. We could derive the charge carrier concentration and mobility of the device from measurements of the low-bias and high-bias photocurrent. The presence of defects is discussed by comparing electroluminescence spectra from biased devices with photoluminescence spectral maps of ZnO dispersions.

Item Type: Article
Erschienen: 2010
Creators: Yan, Wenjing and Mechau, Norman and Hahn, Horst and Krupke, Ralph
Title: Ultraviolet photodetector arrays assembled by dielectrophoresis of ZnO nanoparticles
Language: English
Abstract:

Sensitive and fast ultraviolet sensor arrays have been produced by dielectrophoretic assembling of ZnO nanoparticles. The sub-micron device dimensions induce low operating voltage and low power consumption. The devices are long-term stable and operate in air, oxygen and nitrogen. We have determined the absorption and desorption dynamics from the time-resolved photoresponse and conclude that oxygen or carbon dioxide are the photodesorbed species. We could derive the charge carrier concentration and mobility of the device from measurements of the low-bias and high-bias photocurrent. The presence of defects is discussed by comparing electroluminescence spectra from biased devices with photoluminescence spectral maps of ZnO dispersions.

Journal or Publication Title: Nanotechnology
Volume: 21
Number: 11
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Nov 2011 11:52
Official URL: http://dx.doi.org/10.1088/0957-4484/21/11/115501
Identification Number: doi:10.1088/0957-4484/21/11/115501
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