Question

The mobility and carrier density of Al are 12 cm2/Vs and 1.98×1023 cm−3, respectively. The mobility and carrier density of Cu are 43.2 cm2/Vs and 8.5×1022 cm−3, respectively.

a) Calculate the resisitivity of Al and Cu

b) Which one would you use as interconnects in advanced CMOS nodes?

Answer 1

(a)

(b)  I would use Cu (Copper) as interconnections in advanced CMOS nodes .

Reason :  From the calculations we can easily observe that resistivity of aluminium is more than copper . So conductivity is less for aluminium . Copper conducts electricity better than aluminium . Higher conductivity lines improved overall IC performance .