High spatial resolution thermal conductivity of bulk ZnO (0001)

  • Florescu D
  • Mourokh L
  • Pollak F
 et al. 
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Abstract

We measured high spatial/depth resolution 300 K thermal conductivity κ of the Zn and O surfaces of two bulk n-type ZnO (0001) samples, grown by a vapor-phase transport method, using scanning thermal microscopy (SThM). The thermal investigation was performed in both point-by-point (∼2 μm resolution) and area-scan modes. On the first sample κ=1.16±0.08 (Zn face)/1.10±0.09 (O face) W/cm K while for the second material κ=1.02±0.07 (Zn face)/0.98±0.08 (O face) W/cm K. These are the highest κ values reported on ZnO. A correlation between SThM area-scan readings and surface topography was established by simultaneously performing atomic force microscopy scans. The influence of surface roughness on the effective thermal conductivity (i.e., heat flow) is discussed. © 2002 American Institute of Physics.

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Authors

  • D. I. Florescu

  • L. G. Mourokh

  • Fred H. Pollak

  • D. C. Look

  • G. Cantwell

  • X. Li

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