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Photoresponse of ZnO tetrapod nanocrystal Schottky diodes

Photoresponse of ZnO tetrapod nanocrystal Schottky diodes
Photoresponse of ZnO tetrapod nanocrystal Schottky diodes
The fabrication of an ultraviolet photodiode employing a single ZnO tetrapod nanocrystal is reported. We have attached two tungsten leads and one platinum lead to three of the arms of the tetrapod. By measuring the transport properties between each pair of leads we show that the tungsten contacts are ohmic and the platinum contacts are rectifying. Photoresponse measurements were carried out with above and below band gap illumination. We observe a much larger ultraviolet photoresponse for the rectifying Pt-ZnO-W junction than the linear W-ZnO-W junction. We conclude that the enhanced photoresponse of our rectifying junction results from a photoinduced reduction of the Schottky barrier height at the Pt-ZnO interface.
1941-0085
20 - 23
Newton, Marcus
fac92cce-a9f3-46cd-9f58-c810f7b49c7e
Firth, Steven
23130861-b2b2-45df-8052-aa27c1b0a463
Warburton, P.A.
dcf3f5d6-3433-4441-9bb6-24d0ced7ebf7
Newton, Marcus
fac92cce-a9f3-46cd-9f58-c810f7b49c7e
Firth, Steven
23130861-b2b2-45df-8052-aa27c1b0a463
Warburton, P.A.
dcf3f5d6-3433-4441-9bb6-24d0ced7ebf7

Newton, Marcus, Firth, Steven and Warburton, P.A. (2008) Photoresponse of ZnO tetrapod nanocrystal Schottky diodes. IEEE Transactions on Nanotechnology, 7 (1), 20 - 23. (doi:10.1109/TNANO.2007.915207).

Record type: Article

Abstract

The fabrication of an ultraviolet photodiode employing a single ZnO tetrapod nanocrystal is reported. We have attached two tungsten leads and one platinum lead to three of the arms of the tetrapod. By measuring the transport properties between each pair of leads we show that the tungsten contacts are ohmic and the platinum contacts are rectifying. Photoresponse measurements were carried out with above and below band gap illumination. We observe a much larger ultraviolet photoresponse for the rectifying Pt-ZnO-W junction than the linear W-ZnO-W junction. We conclude that the enhanced photoresponse of our rectifying junction results from a photoinduced reduction of the Schottky barrier height at the Pt-ZnO interface.

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Published date: 14 January 2008

Identifiers

Local EPrints ID: 451573
URI: http://eprints.soton.ac.uk/id/eprint/451573
ISSN: 1941-0085
PURE UUID: 2dd68af7-925a-4792-8627-dde0ecf9ee37

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Date deposited: 12 Oct 2021 16:31
Last modified: 12 Oct 2021 16:31

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Contributors

Author: Marcus Newton
Author: Steven Firth
Author: P.A. Warburton

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