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The growth of ZnO crystals from the melt

Journal of Crystal Growth, ISSN: 0022-0248, Vol: 310, Issue: 12, Page: 3009-3013
2008
  • 52
    Citations
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  • 49
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Metrics Details

  • Citations
    52
    • Citation Indexes
      52
  • Captures
    49

Article Description

The peculiar properties of zinc oxide (ZnO) make this material interesting for very different applications like light emitting diodes, lasers, and piezoelectric transducers. Most of these applications are based on epitaxial ZnO layers grown on suitable substrates, preferably bulk ZnO. Unfortunately the thermochemical properties of ZnO make the growth of single crystals difficult: the triple point 1975∘C, 1.06 bar and the high oxygen fugacity at the melting point pO2=0.35bar lead to the prevailing opinion that ZnO crystals for technical applications can only be grown either by a hydrothermal method or from “cold crucibles” of solid ZnO. Both methods are known to have significant drawbacks. Our thermodynamic calculations and crystal growth experiments show, that in contrast to widely accepted assumptions, ZnO can be molten in metallic crucibles, if an atmosphere with “self-adjusting” pO2 is used. This new result is believed to offer new perspectives for ZnO crystal growth by established standard techniques like the Bridgman method.

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