Patent ID: 8147612

Claim:
A method for fabricating a gallium nitride crystal, comprising the steps of: preparing a gallium nitride substrate including a plurality of first regions, a second region, and a primary surface, each first region having a dislocation density higher than a first dislocation density, the second region having a dislocation density lower than the first dislocation density, a primary surface including first areas and a second area, the first regions being exposed in the first areas, and the second region being exposed in the second area; and growing a gallium nitride crystal using the gallium nitride substrate as a seed crystal substrate by vapor-phase deposition at a growth temperature higher than 1,100° C. and equal to or lower than 1,300° C. without using recesses or a mask in the first areas, wherein when masks and/or recesses are formed on a first region in the substrate, the crystal grown on the substrate does not include any inverted-polarity region.