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To: Zeev Hed who wrote (1008)	12/8/2000 4:39:51 AM
From: Bill Jackson	Read Replies (2) \| Respond to of 1099

Zeev, The lateral spreading from hot spots is probably the reason that epi is valuable since the hotspots are where the parts fail anything that helps there is valuable. I did not know the substrate was that heavily doped but I can see the potential for disturbing the structure that had become so regular with Si28. The only caveat is the comment that heavy doping is still a trace element factor compared to the difference between pure and the natural isotope ratios in Si and that means the phonon disruption might be far lower as the doping affects the electrical properties and not the phonon properties which are a gross effect. What is the cost of a normal wafer, compared to a Si28 wafer covered with an epi layer of Si28? I had heard that a common wafer cost about $2500 thus the epi layer would add only a few hundred dollars to the cost, if that. Bulk Si28 will cost more, however that $75,000 per kilo seems an early low volume price. I suspect that the 20 tons AMD is dickering on will have a far lower cost. Bill