摘要:
Reactor designs for use in ammonothermal growth of group-III nitride crystals. Internal heating is used to enhance and/or engineer fluid motion, gas mixing, and the ability to create solubility gradients within a vessel used for the ammonothermal growth of group-III nitride crystals. Novel baffle designs are used for control and improvement of continuous fluid motion within a vessel used for the ammonothermal growth of group-III nitride crystals.
摘要:
A method to improve the crystal purity of a group-I11 nitride crystal grown in an ammonothermal growth system by removing any undesired material (i.e., impurities) from within the system prior to, in-between, or after the growth steps for the group-I11 nitride crystal. Impurities are removed from the ammonothermal growth system by first bringing the impurities into solution and then removing part or all of the solution from the growth system. The result is a high purity group-I11 nitride crystal grown in the ammonothermal growth system.
摘要:
Boron-containing compounds, gasses and fluids are used during ammonothermal growth of group-Ill nitride crystals. Boron-containing compounds are used as impurity getters during the ammonothermal growth of group-Ill nitride crystals. In addition, a boron-containing gas and/or supercritical fluid is used for enhanced solubility of group-Ill nitride into said fluid.
摘要:
Reactor designs for use in ammonothermal growth of group-III nitride crystals. Internal heating is used to enhance and/or engineer fluid motion, gas mixing, and the ability to create solubility gradients within a vessel used for the ammonothermal growth of group-III nitride crystals. Novel baffle designs are used for control and improvement of continuous fluid motion within a vessel used for the ammonothermal growth of group-III nitride crystals.
摘要:
A method for controlling the relative and absolute growth rates of all possible crystallographic planes of a group-III nitride crystal during ammonothermal growth. The growth rates of the various exposed crystallographic planes of the group-III nitride crystal are controlled by modifying the environment and/or conditions within the reactor vessel, which may be subdivided into a plurality of separate zones, wherein each of the zones has their own environment and conditions. The environment includes the amount of atoms, compounds and/or chemical complexes within each of the zones, along with their relative ratios and the relative motion of the atoms, compounds and/or chemical complexes within each of the zones and among the zones. The conditions include the thermodynamic properties each of the zones possess, such as temperatures, pressures and/or densities.
摘要:
Boron-containing compounds, gasses and fluids are used during ammonothermal growth of group-Ill nitride crystals. Boron-containing compounds are used as impurity getters during the ammonothermal growth of group-Ill nitride crystals. In addition, a boron-containing gas and/or supercritical fluid is used for enhanced solubility of group-Ill nitride into said fluid.
摘要:
Reactor designs for use in ammonothermal growth of group-III nitride crystals envision a different relative placement of source materials and seed crystals with respect to each other, and with respect to the vessel containing a solvent. This placement results in a difference in fluid dynamical flow patterns within the vessel.
摘要:
A method for adding hydrogen-containing and/or nitrogen-containing compounds to a nitrogen-containing solvent used during ammonothermal growth of group-Ill nitride crystals to offset decomposition products formed from the nitrogen-containing solvent, in order to shift the balance between the reactants, i.e. the nitrogen-containing solvent and the decomposition products, towards the reactant side.
摘要:
The present invention provides a method for growing group III-nitride crystals wherein the group III-nitride crystal growth occurs on an etched seed crystal. The etched seed is fabricated prior to growth using a temperature profile which produces a high solubility of the group III-nitride material in a seed crystals zone as compared to a source materials zone. The measured X-ray diffraction of the obtained crystals have significantly narrower Full Width at Half Maximum values as compared to crystals grown without etch back of the seed crystal surfaces prior to growth.
摘要:
An ammonothermal growth of group-III nitride crystals on starting seed crystals with at least two surfaces making an acute, right or obtuse angle, i.e., greater than 0 degrees and less than 180 degrees, with respect to each other, such that the exposed surfaces together form a concave surface.