Surface analysis and optical properties of Cu-doped ZnO thin films deposited by radio frequency magnetron sputtering

Guo Ju Chen, Sheng Rui Jian*, Jenh-Yih Juang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In this study, Cu-doped ZnO (CZO) thin films were grown on glass substrates by using the radio frequency magnetron sputtering technique. The effects of Cu doping on the structural, surface morphological, optical properties, and wettability behaviors of CZO thin films were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), UV-Visible spectroscopy, and contact angle measurement, respectively. The XRD results indicated that all CZO thin films were textured, having a preferential crystallographic orientation along the hexagonal wurtzite (002) axis. The average transmittance in the visible wavelength region was above 80% for all CZO thin films. The optical band gap of the CZO films decreased from 3.18 to 2.85 eV when the Cu-doping was increased from 2% to 10%. In addition, the water contact angle measurements were carried out to delineate the Cu-doping effects on the changes in the surface energy and wettability of the films.

Original languageEnglish
Article number266
JournalCoatings
Volume8
Issue number8
DOIs
StatePublished - 1 Aug 2018

Keywords

  • AFM
  • Cu-doped ZnO thin film
  • Surface energy
  • UV-Vis
  • XRD

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