Abstract:
In this work, Cu-MWCNT composite is recommended as a potential solution to diminish breakdown
in copper interconnects caused due to self- heating. CuMWCNT composite is less affected by temperature variation
as compared to copper interconnect by 33%. To support this
deduction, lateral temperature profiles of copper and CuMWCNT composite are compared which shows that copper
interconnect reaches a higher temperature point due to selfheating as compared to Cu-MWCNT composite interconnect.
Delay in Cu-MWCNT composite interconnect turned out to
be lesser than copper interconnect. Also, increase in the
fraction of MWCNT in Cu-MWCNT composite (FMW CNT )
leads to decrease in delay. Cu-MWCNT composite with
higher FMW CNT experiences lesser Noise Delay Product
(NDP) among all the alternatives which makes it most advantageous in terms of signal integrity. NDP of Cu-MWCNT
composite interconnects are almost constant with increase in
temperature making it immune to thermal effects. MWCNT
has the highest reliability in terms of breakdown power (PBD)
while 1 mm long Cu-MWCNT composite (with FMW CNT
= 0.6) when compared to copper has 61% improvement in
breakdown power. Cu-MWCNT composite interconnect is
much better than copper interconnect specially for longer
wire and higher FMW CNT in terms of NDP/PBD ratio.
Our analysis recommends long Cu-MWCNT composite (with
FMW CNT ∼ 0.6) interconnects to replace copper interconnects as a solution to increased self-heating in copper leading
to its breakdown and also improvement in signal integrity
aspects.
