Effects of thermal annealing on the morphology of the AlxGa(1-x)N films


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Corekci S., Tekeli Z., Cakmak M. , Ozcelik S. , Dinc Y., Zeybek O., ...More

Materials Science in Semiconductor Processing, vol.12, no.6, pp.238-242, 2009 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 6
  • Publication Date: 2009
  • Doi Number: 10.1016/j.mssp.2009.12.004
  • Title of Journal : Materials Science in Semiconductor Processing
  • Page Numbers: pp.238-242

Abstract

Effects of thermal annealing on the morphology of the AlxGa(1-x)N films with two different high Al-contents (x=0.43 and 0.52) have been investigated by atomic force microscopy (AFM). The annealing treatments were performed in a nitrogen (N2) gas ambient as short-time (4 min) and long-time (30 min). Firstly, the films were annealed as short-time in the range of 800-950 °C in steps of 50-100 °C. The surface root-mean-square (rms) roughness of the films reduced with increasing temperature at short-time annealing (up to 900 °C), while their surface morphologies were not changed. At the same time, the degradation appeared on the surface of the film with lower Al-content after 950 °C. Secondly, the Al0.43Ga0.57N film was annealed as long-time in the range of 1000-1200 °C in steps of 50 °C. The surface morphology and rms roughness of the film with increasing temperature up to 1150 °C did not significantly change. Above those temperatures, the surface morphology changed from step-flow to grain-like and the rms roughness significantly increased. © 2009 Elsevier Ltd. All rights reserved.