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To: Ali Chen who wrote (162579)	3/20/2002 11:28:51 AM
From: Ali Chen	Read Replies (1) \| Respond to of 186894

"At present, the price of a 300 mm wafer is about 7x to 8x that of a 200 mm wafer" - hmm, from the same article... semi.org!OpenDocument - Ali

To: Ali Chen who wrote (162579)	3/20/2002 1:41:57 PM
From: Yousef	Read Replies (2) \| Respond to of 186894

Ali, Re: "This is an utter BS I ever heard of ..." It is true that 300mm defect density is better at this point relative to the 150mm -> 200mm conversion. This is due to the FACT that the defect mechanisms on 300mm seem to be the same as encountered at 200mm AND the amount of edge/center ratio continues to decrease. The edge of the wafer will almost always yield more poorly than the center due to film/polish/litho non-uniformities at the edge. Thus 300mm should intrinsically have lower defect density better yield) than 200mm. BTW Ali, please consider sticking to the "architecture thingy" in the future. TIA. Make It So, Yousef