Patent application number | Description | Published |
20080223288 | Crystal growing apparatus - An object of the invention is to carry out the flux method with improved work efficiency while maintaining the purity of flux at high level and saving flux material cost. The sodium-purifying apparatus includes a sodium-holding-and-management apparatus for maintaining purified sodium (Na) in a liquid state. Liquid sodium is supplied into a sodium-holding-and-management apparatus through a liquid-sodium supply piping maintained at 100° C. to 200° C. The sodium-holding-and-management apparatus further has an argon-gas-purifying apparatus for controlling the condition of argon (Ar) gas that fills the internal space thereof. Thus, by opening and closing a faucet at desired timing, purified liquid sodium (Na) supplied from the sodium-purifying apparatus can be introduced into a crucible as appropriate via the liquid-sodium supply piping, the sodium-holding-and-management apparatus, and the piping. | 09-18-2008 |
20080302297 | Method of recovering sodium metal from flux - It is provided a method for gently and safely recovering only sodium metal from a flux containing sodium metal in a short time and in a reusable form. Flux | 12-11-2008 |
20090038539 | PROCESS FOR PRODUCING SINGLE CRYSTAL - A raw material mixture containing an easily oxidizable material is weighed. The raw material mixture is melted and then solidified within a reaction vessel | 02-12-2009 |
20090078193 | PROCESS FOR PRODUCING A NITRIDE SINGLE CRYSTAL AND APPARATUS THEREFOR - A growth apparatus is used having a plurality of crucibles | 03-26-2009 |
20090095212 | Method for manufacturing single crystal of nitride - A seed crystal | 04-16-2009 |
20100012020 | METHOD FOR MANUFACTURING NITRIDE SINGLE CRYSTAL - A nitride single crystal is produced on a seed crystal substrate | 01-21-2010 |
20100307404 | Method for manufacturing III metal nitride single crystal - It is used a substrate main body | 12-09-2010 |
20110274609 | Group 3B nitride crystal substrate - A group 13 nitride crystal substrate according to the present invention is produced by growing a group 13 nitride crystal on a seed-crystal substrate by a flux method, wherein a content of inclusions in the group 13 nitride crystal grown in a region of the seed-crystal substrate except for a circumferential portion of the seed-crystal substrate, the region having an area fraction of 70% relative to an entire area of the seed-crystal substrate, is 10% or less, preferably 2% or less. | 11-10-2011 |
20110287222 | Group 3B nitride crystal - A sapphire substrate on a surface of which a thin film of gallium nitride is formed is prepared as a seed-crystal substrate and placed in a growth vessel. Gallium and sodium metals are weighed to achieve a molar ratio of 25 to 32:68 to 75 and added into the vessel. The vessel is put into a reaction vessel. An inlet pipe is connected to the reaction vessel. Nitrogen gas is introduced from a nitrogen tank through a pressure controller to fill the reaction vessel. While the internal pressure of the reaction vessel is controlled to be a predetermined nitrogen gas pressure and target temperatures are set such that the temperature of a lower heater is higher than the temperature of an upper heater, a gallium nitride crystal is grown. As a result, a group 13 nitride crystal having a large grain size and a low dislocation density is provided. | 11-24-2011 |
20120012984 | METHOD FOR GROWING GROUP 13 NITRIDE CRYSTAL AND GROUP 13 NITRIDE CRYSTAL - To grow a gallium nitride crystal, a seed-crystal substrate is first immersed in a melt mixture containing gallium and sodium. Then, a gallium nitride crystal is grown on the seed-crystal substrate under heating the melt mixture in a pressurized atmosphere containing nitrogen gas and not containing oxygen. At this time, the gallium nitride crystal is grown on the seed-crystal substrate under a first stirring condition of stirring the melt mixture, the first stirring condition being set for providing a rough growth surface, and the gallium nitride crystal is subsequently grown on the seed-crystal substrate under a second stirring condition of stirring the melt mixture, the second stirring condition being set for providing a smooth growth surface. | 01-19-2012 |
20120111264 | METHOD FOR PRODUCING GROUP III METAL NITRIDE SINGLE CRYSTAL - A plurality of seed crystal films of a single crystal of a nitride of a metal belonging to group III are formed on a substrate, while a non-growth surface not covered with the seed crystal films is formed on the substrate. A single crystal of a nitride of a metal belonging to group III is grown on the seed crystal film. A plurality of the seed crystal films are separated by the non-growth surface and arranged in at least two directions X and Y. The maximum inscribed circle diameter “A” of the seed crystal film is 50 μm or more and 6 mm or less, a circumscribed circle diameter “B” of the seed crystal film is 50 μm or more and 10 mm or less, and the maximum inscribed circle diameter “C” of the non-growth surface | 05-10-2012 |
20120175740 | BASE SUBSTRATE, GROUP 3B NITRIDE CRYSTAL, AND METHOD FOR MANUFACTURING THE SAME - Regarding a base substrate, a plurality of steps are formed stepwise on the principal surface (c-face). Each step has a height difference of 10 to 40 μm, and an edge is formed parallel to an a-face of a hexagonal crystal of GaN. Meanwhile, the terrace width of each step is set at a predetermined width. The predetermined width is set in such a way that after a GaN crystal is grown on the principal surface of the base substrate, the principal surface is covered up with grain boundaries when the grown GaN crystal is observed from the surface side. The plurality of steps can be formed through, for example, dry etching, sand blasting, lasing, and dicing. | 07-12-2012 |
20130221490 | METHOD FOR GROWING GROUP 13 NITRIDE CRYSTAL AND GROUP 13 NITRIDE CRYSTAL - To grow a gallium nitride crystal, a seed-crystal substrate is first immersed in a melt mixture containing gallium and sodium. Then, a gallium nitride crystal is grown on the seed-crystal substrate under heating the melt mixture in a pressurized atmosphere containing nitrogen gas and not containing oxygen. At this time, the gallium nitride crystal is grown on the seed-crystal substrate under a first stirring condition of stirring the melt mixture, the first stirring condition being set for providing a rough growth surface, and the gallium nitride crystal is subsequently grown on the seed-crystal substrate under a second stirring condition of stirring the melt mixture, the second stirring condition being set for providing a smooth growth surface. | 08-29-2013 |
20130263771 | CRYSTAL PRODUCTION METHOD - A crystal production method according to the present invention includes a film formation and crystallization step of spraying a raw material powder containing a raw material component to form a film containing the raw material component on a seed substrate containing a single crystal at a predetermined single crystallization temperature at which single crystallization of the raw material component occurs, and crystallizing the film containing the raw material while maintaining the single crystallization temperature. In the film formation and crystallization step, preferably, the single crystallization temperature is 900° C. or higher. Furthermore, in the film formation and crystallization step, preferably, the raw material powder and the seed substrate are each a nitride or an oxide. | 10-10-2013 |
20140014028 | Method for Producing Gallium Nitride Layer and Seed Crystal Substrate Used in Same - A gallium nitride layer is produced using a seed crystal substrate by flux method. The seed crystal substrate | 01-16-2014 |
20140026809 | Process for Producing Group 13 Metal Nitride, and Seed Crystal Substrate for Use in Same - A seed crystal substrate | 01-30-2014 |