EETimes heeft een artikeltje gepost over problemen met lage yields bij chip bakkers die met koper aan de slag gaan:
"The yields people are seeing for copper are not fantastic," said Dan Hutcheson, president of VLSI Research Inc. (San Jose, Calif.), "although for some people they aren't that bad." He stressed that the learning curve from aluminum to copper is long, steep and expensive. Companies hoping to put off buying the pricey tools until the technology seems fairly stable might encounter a nasty surprise. "Copper is not a plain-vanilla process, and you can't just buy the tools and run them out of the box," Hutcheson said.
While Hutcheson noted that chip companies with the most advanced copper programs may be seeing yields of 40 to 50 percent, that's significantly below the 60 to 70 percent range that today is considered desirable for leading-edge technology. Other chip companies that are just beginning their copper development efforts may have yields close to zero. "Using copper is a multi-damascene integration nightmare, and that's what's catching all these companies unawares," said Hutcheson.
Uiteraard gaan we ons nu meteen afvragen of dit gevolgen heeft voor de produktie van AMD's Dresden fab (waar vanaf volgend jaar koperen Athlons vandaan moeten komen).