Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Georg Müller

Jochen Friedrich

Bernhard Birkmann

Stephan Hussy

Elke Meissner

Rainer Apelt

The present invention relates to a method for the production of crystal layers or bulk crystals of group III nitride or of mixtures of different group III nitrides by means of precipitation, at a first temperature Tin a first temperature range, from a group-III containing fused metal on a group-III-nitride crystal seed placed in the fused metal or on a foreign substrate placed in the fused metal, with the admixture of nitrogen in the fused metal at a pressure P. With the method a solvent additive is added to the fused metal which increases the conversion rate of group III metal to group III nitride in the fused metal. The fused metal runs through at least one temperature cycle with a first and a second process phase in which cycle the fused metal cools after the first process phase from the first temperature to a second temperature Tbelow the first temperature range and at the end of the second process phase is heated from the second temperature back to a temperature within the first temperature range. The described method permits producing group III nitride crystal layers with a thickness of &#x3e;10 &#x3bc;m, respectively massive crystals with a diameter of &#x3e;10 mm at dislocation densities of &#x3c;10cmat temperatures below 1100&#xb0; C. and process pressures below 5&#xd7;10Pa.

Method for the production of group III nitride bulk crystals or crystal layers from fused metals

The present invention relates to a method for increasing the conversion of group III metal to group III nitride in a fused metal containing group III elements, with the introduction of nitrogen into the fused metal containing group III, at temperatures&#x2266;1100&#xb0; C. and at pressures of below 1&#xd7;10Pa, wherein a solvent adjunct is added to the fused metal containing group III elements, which is at least one element of the following elements C, Si, Ge, Fe, and/or at least one element of the rare earths, or an alloy or a compound of these elements, in particular their nitrides.

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Munich, Georgia

Georg Müller