The growth of AZO nanostructures with high doping concentration using vertical reaction layer synthesizing method and their applications

Jian Fu Tang, Yang Ming Lu, Sheng Yuan Chu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This study developed a hybrid nanostructure comprising zinc oxide (ZnO) nanorods and aluminium doped ZnO (AZO) nanowalls using a chemical bath deposition method for use in near-ultraviolet (NUV) photosensors. We report on a means of tuning the morphology of ZnO nanostructure using Al thin film as a doping source. An increase in the thickness of the Al thin film causes the evolution of the morphology from nanorods to nanowalls. X-ray photoelectron spectroscopy (XPS) data indicate an increase in the concentration of Al doping from 0 to 9.59 wt.%. Transmission electron microscopy indicates that the ZnO nanorods are single-crystal formations whereas the AZO nanowalls are composed of numerous single-crystal grains. UV-vis absorption spectra revealed a new area of absorption resulting from the AZO nanostructure. The resulting photosensor was tested using a 405 nm light-emitting diode (LED) at a voltage bias of 1 V across the device, wherein a photocurrent-to-dark-current ratio of 99.5 was observed. Our results demonstrate that the low-temperature fabrication of near-UV photosensors using a novel structure comprising nanorods and nanowalls is a feasible and effective approach.

Original languageEnglish
Pages (from-to)327-333
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume225
DOIs
Publication statusPublished - 2016 Mar 31

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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