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To: Chuca Marsh who wrote (1129)7/1/1999 11:55:00 PM
From: Zeev Hed  Read Replies (1) of 1364
 
Chuca, Tom's remark about that PR are absolutely correct, the comments about GaN photovoltaic cells were at best "sloppy" and at worst misleading and erroneous. By the way, there is not that much energy falling on the earth from the sun, your figure of merit is a KW per square meter, and I doubt that more than 25% of that can ever be extracted as electricity, cost is a major driver and inhibitor with Si (which is getting "dirt cheap"), GaN, whether grown on sapphire (as the Japanese are doing) or on SiC (a yet cumbersome approach), have huge amounts of dislocations (the best I believe around 100,000/cm^2) and cost a fortune. I do not know of any GaN native wafers, but maybe someone is managing to grow it.

Unlike light sources that can use a very small dye, solar cells need large surfaces, and even GaAs is too expensive for all but the most demanding (and thus premium paying) applications.

Zeev
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