Patent ID: 8227826
Filing Date: 2012-07-24
Classification: C30B,H01L

Abstract:
1. A GaN-substrate storage system comprising: a storage container internally establishing a sealed atmosphere containing either nitrogen gas or argon gas and being hermetic to oxygen and water vapor, said storage-container atmosphere therein for sealing a plurality of substrates and having a temperature from 5° C. to 60° C. and having an oxygen concentration of from 0.6 vol. % to 5 vol. % and/or a water-vapor concentration of from 1 g/m at least one device-formation-ready GaN substrate sealed inside said storage container, said GaN substrate defining first and second principal faces, and the first principal face having a surface roughness Ra of from 2 nm to 20 nm and the second principal face having a surface roughness Ra of from 2.4 μm to 20 μm, wherein an off-axis angle formed by the principal faces on said GaN substrate and its (0001) plane is between 0.05° and 2°, inclusive, in the <1 a storing device, storing said storage container, and equipped with a gas-introducing valve and, connected to said gas-introducing valve, an inert-gas introduction line, and equipped with a gas-exhaust valve and, connected to said gas-exhaust valve, a gas-exhaust line, said storing device therein for creating said storage-container atmosphere by enabling, via said gas-introducing valve and said inert-gas introduction line, the introduction into the storing device of an inert gas of from 0.6 vol. % to 5 vol. % oxygen concentration and from 1 g/m