Skip to main content
Article
Microstructure of ZnO Thin Films Deposited by High Power Impulse Magnetron Sputtering
Thin Solid Films
  • Amber N. Reed, Air Force Research Laboratory
  • Patrick J. Shamberger, Air Force Research Laboratory
  • Jianjun Hu, University of Dayton
  • Christopher Muratore, University of Dayton
  • John E. Bultman, University of Dayton
  • Andrey A. Voevodin, Air Force Research Laboratory
Document Type
Article
Publication Date
3-1-2015
Abstract
High power impulse magnetron sputtering was used to deposit thin (~ 100 nm) zinc oxide (ZnO) films from a ceramic ZnO target onto substrates heated to 150 °C. The resulting films had strong crystallinity, highly aligned (002) texture and low surface roughness (root mean square roughness less than 10 nm), as determined by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and atomic force spectroscopy measurements. Deposition pressure and target–substrate distance had the greatest effect on film microstructure. The degree of alignment in the films was strongly dependent on the gas pressure. Deposition at pressures less than 0.93 Pa resulted in a bimodal distribution of grain sizes. An initial growth layer with preferred orientations (101) and (002) parallel to the interface was observed at the film–substrate interface under all conditions examined here; the extent of that competitive region was dependent on growth conditions. Time-resolved current measurements of the target and ion energy distributions, determined using energy resolved mass spectrometry, were correlated to film microstructure in order to investigate the effect of plasma conditions on film nucleation and growth.
Inclusive pages
30–37
ISBN/ISSN
0040-6090
Comments

Permission documentation is on file.

Publisher
Elsevier
Peer Reviewed
Yes
Citation Information
Amber N. Reed, Patrick J. Shamberger, Jianjun Hu, Christopher Muratore, et al.. "Microstructure of ZnO Thin Films Deposited by High Power Impulse Magnetron Sputtering" Thin Solid Films Vol. 579 Iss. 31 (2015)
Available at: http://works.bepress.com/christopher-muratore/60/