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Technology Stocks : VALENCE TECHNOLOGY (VLNC)
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To: kolo55 who wrote (7294)1/21/1999 1:06:00 PM
From: Zeev Hed  Read Replies (1) of 27311
 
Paul, yield correlates somewhat to size in laminating processes as well (it is more difficult to maintain perfect parallelism when the aspect ratio , namely length/width vs thickness increases to 100 to 1 or more as in batteries 10 cm long and 1 mm thick), but not the way yields decrease in semi production where the final yield is the product of the yields in each step, which could be as high as 25 steps. I presume that the number of sequential "steps" in a battery is no more then 5, some of which are not really critical. On the other hand, the intrinsic yield per step in batteries is probably much lower than in wafer production since you are handling pastes, adhesives and chemically complex electrodes in the lamination process, but the difference in yields between a 2 cm battery and a 10 cm should not be a factor of 5 as the size would indicate. The yield in this process is probably as amenable to "learning curve" techniques as are wafer processes, IMHO.

Zeev
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