The Big Blue sez: copper interconnects are here to stay
When aluminium interconnects became too slow for complementary metal oxide semiconductors () at the 180 nanometre node, IBM led the way to the now universally used copper interconnects starting in 1997.
20 years since IBM a.k.a., The Big Blue started leading the way in copper interconnects at the then sensational 180 nm node for CMOS circuits many other interconnects are being proposed to replace copper, notably graphene. Despite that, IBM, says it will stick to copper claiming that slight tweaks to the copper deposition make it the preferred option pretty much for as long as CMOS will last.
"Graphene is not readily manufacturable, and furthermore end-to-end comparisons show graphene does not flow uniformly and can't achieve the low resistances of enhanced copper interconnects," IBM Fellow Dan Edelstein said at a recent Nanotechnology Symposium talk. He explained...