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

• 作者: 宗仙丽 朱荣
• 来源期刊: 中国物理B（英文版）
• 关键词: ZnO nanorods UV photoresponse surface effect applied voltage effect
• 年，卷（期）: 2015,（10）
• 页码范围: 107703-1-107703-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/10/107703

摘要

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 am-bient 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 en-hancement 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 ?C could be shortened from 34.8 s to 0.24 s with a bias of 4 V applied between anode and cathode.