Jari Ketola
18 Apr 2003 5:34
Japanese Sumitomo Electric Industries has started to mass produce two inch low-dislocation gallium nitride (GaN) substrates. GaN semiconductors are used to produce the violet (405nm) laser used for reading and recording Blu-Ray, and other "blue laser" formats. Low-dislocation GaN substrate is superior to sapphire substrates, which suffer from high dislocation (crystal defects) and hence have a low yield.
Sumitomo is currently capable of producing 200 substrates a month, but will step up production to 500 by October.
To learn more about Sumitomo's method read their article on GaN substrate.
Source:
the inquirer