中国物理B ›› 2015, Vol. 24 ›› Issue (10): 107703-107703.doi: 10.1088/1674-1056/24/10/107703

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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

宗仙丽, 朱荣   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 收稿日期:2015-02-28 修回日期:2015-05-06 出版日期:2015-10-05 发布日期:2015-10-05
  • 基金资助:

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

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

Zong Xian-Li (宗仙丽), Zhu Rong (朱荣)   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • Received:2015-02-28 Revised:2015-05-06 Online:2015-10-05 Published:2015-10-05
  • Contact: Zhu Rong E-mail:rong_zhu@263.net
  • Supported by:

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

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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 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.

关键词: ZnO nanorods, UV photoresponse, surface effect, applied voltage effect

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.

Key words: ZnO nanorods, UV photoresponse, surface effect, applied voltage effect

中图分类号:  (ZnO)

  • 77.55.hf
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)