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To: John Finley who wrote (111)	12/9/1999 4:36:00 PM
From: kinkblot	Respond to of 565

Platelets, eh? It's a start. I assume that when American Xtal says they're "working to develop other high-performance compound substrates, such as Gallium Nitride (GaN)," they mean using their VGF technique or some modification of it. axt.com None of the other compound semiconductor substrates they sell are nitrides. This looks like a real challenge; it could even become a quest. OTOH, for the successful company, there will be a higher barrier to competition than in other substrate markets. WT

To: John Finley who wrote (111)	12/10/1999 9:08:00 AM
From: kinkblot	Read Replies (2) \| Respond to of 565

MIJ-NSR Volume 4S1, Symposium on "GaN and Related Alloys", Dec 98 nsr.mij.mrs.org G1.3. Near Defect Free GaN Substrates, by S. Porowski covers some of the issues involved in growing GaN crystals. He's making some progress using the High Pressure Solution Growth (HPSG) method with Mg doping, though his highest quality crystals are still small, ~14 mm maximum dimension. This guy is from the Polish Academy of Sciences, not that there's anything wrong with that. WT

To: John Finley who wrote (111)	3/18/2000 4:46:00 PM
From: kinkblot	Read Replies (3) \| Respond to of 565

Sumitomo: Development of GaN Single-Crystal SEI NEWS No.00-02, February 2000 sei.co.jp Utilizing the thermodynamic developments and expertise of Professor Seki and Assistant Professor Koukitu of the Faculty of Engineering of Tokyo University of Agriculture and Technology and drawing from its own unique methodology, Sumitomo Electric has expanded upon previously cultivated technology to successfully grow two-inch crystal substrates for epitaxy. The gallium nitride single-crystal substrate is conductive, which allows electrodes to be placed on both sides of the chip. Compared with sapphire, gallium nitride should reduce chip size in half and lower costs. A reflection plane, which is required for manufacturing laser chips, is generally made with a cleavage plane. They're using thermodynamics? That's not fair. <g> High-tech pluggers. WT