Patent ID: 7811908
Filing Date: 2010-10-12
Classification: C30B,H01L

Abstract:
1. A GaN substrate storing method employing a storing device equipped with gas introduction and exhaust valves connected to respective introduction and exhaust lines, the GaN substrate storing method comprising: a placement step of placing a plurality of device-formation-ready GaN substrates into the storing device, with the temperature of the atmosphere inside the storing device being from 5° C. to 60° C., wherein prior to said placement step, the device-formation-ready GaN substrates are each processed so as to have, along a first principal face of each of the GaN substrates, a surface roughness Ra of 20 nm or less, and so as to have, along a second principal face of each of the GaN substrates, a surface roughness Ra of 20 μm or less; a gas-introduction/exhaust step of introducing into the storing device, via the gas-introduction lines and valves, an inert gas of not more than 18 vol. (% oxygen concentration and not more than 25 g/m a sealing step of sealing the plurality of substrates into a storage container hermetic to oxygen and water vapor.