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 degrees C, 1.06 bar and the high oxygen fugacity at the melting point po(2) = 0.35 bar 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 is assumptions, ZnO can be molten in metallic crucibles, if an atmosphere with "self-adjusting" po(2) used. This new result is believed to offer new perspectives for ZnO crystal growth by established standard techniques like the Bridgman method. (c) 2008 Elsevier B.V. All rights reserved.

The growth of ZnO crystals from the melt / D., Klimm; S., Ganschow; D., Schulz; Fornari, Roberto. - In: JOURNAL OF CRYSTAL GROWTH. - ISSN 0022-0248. - 310:(2008), pp. 3009-3013. [10.1016/j.jcrysgro.2008.02.027]

The growth of ZnO crystals from the melt

FORNARI, Roberto
2008-01-01

Abstract

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 degrees C, 1.06 bar and the high oxygen fugacity at the melting point po(2) = 0.35 bar 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 is assumptions, ZnO can be molten in metallic crucibles, if an atmosphere with "self-adjusting" po(2) used. This new result is believed to offer new perspectives for ZnO crystal growth by established standard techniques like the Bridgman method. (c) 2008 Elsevier B.V. All rights reserved.
2008
The growth of ZnO crystals from the melt / D., Klimm; S., Ganschow; D., Schulz; Fornari, Roberto. - In: JOURNAL OF CRYSTAL GROWTH. - ISSN 0022-0248. - 310:(2008), pp. 3009-3013. [10.1016/j.jcrysgro.2008.02.027]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2683993
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