Effects of Cu diffusion-doping on structural, optical, and magnetic properties of ZnO nanorod arrays grown by vapor phase transport method


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Yilmaz S., McGlynn E., BACAKSIZ E. , ÖZCAN Ş., Byrne D., Henry M. O. , ...Daha Fazla

JOURNAL OF APPLIED PHYSICS, cilt.111, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 111 Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1063/1.3673861
  • Dergi Adı: JOURNAL OF APPLIED PHYSICS

Özet

Well-aligned ZnO nanorods were prepared by the vapor phase transport method on Si covered with a ZnO buffer layer. After the nanostructure growth, Cu was doped into the ZnO nanorods by diffusion at three different temperatures and for different times. Undoped and Cu diffusion-doped ZnO samples are highly textured, with the c axis of the wurtzite structure along the growth direction. The incorporation of Cu caused some slight changes in the nanorod alignment, although the wurtzite crystal structure was maintained. X-ray photoelectron spectroscopy measurements revealed that Cu ions were in a divalent state and substituted for the Zn2+ ions of the ZnO matrix. Photoluminescence results at 10K indicate that the incorporation of copper leads to a relative increase of Cu-related structured green band deep level intensity. Magnetic measurements revealed that both undoped and Cu diffusion-doped ZnO samples exhibited room temperature ferromagnetism. It was also found that bound magnetic polarons play an important role in the appearance of room temperature ferromagnetism in Cu diffusion-doped ZnO nanorods. (C) 2012 American Institute of Physics. [doi:10.1063/1.3673861]