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Technology Stocks : White light from LED
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To: kinkblot who wrote (96)12/5/1999 11:06:00 PM
From: John Finley  Read Replies (1) of 565
 
>>but even Cree must use transition layers<<

I suppose it could be a chemical incompatibility (reaction or something). Could be that Si or C is a carrier trap in the GaN.

So they are contacting through the substrate and buffer(s). I was looking for the band gap of Al2O3 but the only reference I can get my hands on is Kittel. Hey, Cu2O has a band gap of 2.2 eV AND it's direct. Diamond is 5.4 eV, indirect.

So are those micropipes a good thing or a bad thing. Maybe they let surface diffusion suck up some of the metal contact layer <g>.

I wonder if anyone ever grew an epi oxide or nitride on a metal crystal without ion beam assistance.

Now there's some work. Cutting crystals off-axis to see which one grows the best epi-layer <g>.

Thanks again for all the goodies to munch on. You're making me lazy <g>.

JF
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