Effects of surface adsorbed oxygen, applied voltage, and temperature on UV photoresponse of ZnO nanorods

doi:10.1088/1674-1056/24/10/107703

Abstract

The ultraviolet (UV) photoresponses of ZnO nanorods directly grown on and between two micro Au-electrodes by using electric-field-assisted wet chemical method are measured comprehensively under different conditions, including ambient environment, applied bias voltage, gate voltage and temperature. Experimental results indicate that the photoresponses of the ZnO nanorods can be modulated by surface oxygen adsorptions, applied voltages, as well as temperatures. A model taking into account both surface adsorbed oxygen and electron-hole activities inside ZnO nanorods is proposed. The enhancement effect of the bias voltage on photoresponse is also analyzed. Experimental results shows that the UV response time (to 63%) of ZnO nanorods in air and at 59 ℃ could be shortened from 34.8 s to 0.24 s with a bias of 4 V applied between anode and cathode.

Keywords: ZnO nanorods UV photoresponse surface effect applied voltage effect

Received: 28 February 2015
Revised: 06 May 2015
Accepted manuscript online:

PACS:	77.55.hf	(ZnO)
	78.67.Qa	(Nanorods)
	95.85.Mt	(Ultraviolet (10-300 nm))
	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 91123017).

Corresponding Authors: Zhu Rong
E-mail: rong_zhu@263.net

Cite this article:

Zong Xian-Li (宗仙丽), Zhu Rong (朱荣) Effects of surface adsorbed oxygen, applied voltage, and temperature on UV photoresponse of ZnO nanorods 2015 Chin. Phys. B 24 107703

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Effects of surface adsorbed oxygen, applied voltage, and temperature on UV photoresponse of ZnO nanorods

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