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Technology Stocks : White light from LED
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To: John Finley who wrote (101)12/7/1999 6:19:00 PM
From: kinkblot  Read Replies (1) of 565
 
GaN wafers, anyone?

Excerpt from page 20 of American Xtal's third quarter 10-Q:

RISKS Relating to Our Operations
...
...In 1997, we began commercial shipments of Ge and InP substrates and are currently developing other substrates, including gallium phosphide, gallium nitride and silicon carbide. Factors that may affect the success of product improvements and product introductions include the development of markets for such improvements and substrates, achievement of acceptable yields, price and market acceptance. Many of these factors are beyond our control.

GaN substrates would be nice. I don't think they'd have much problem with development of markets. Has anyone succeeded in doing this yet?

The Epitronics subsidiary of ATMI sells GaN-on-sapphire substrates.

This 4/9/98 EETimes story mentions a technique developed by Nichia called Epitaxially Laterally OverGrown (ELOG) GaN:
eet.com

Matsushita Electric Industrial Co. Ltd. and CBL Technologies Inc. (Redwood, Calif.) last July announced a challenging development effort to produce a large pure GaN wafer, with sampling targeted for this year. Nichia's approach is to avoid difficult GaN wafer development by using a sapphire substrate. First, a 100-micron-thick GaN layer is formed on the sapphire substrate, then the sapphire substrate is removed by polishing to leave an 80-micron-thick GaN substrate.

I couldn't find anything more on the Matsushita / CBL effort.

WT
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