Question

the material popularly used for contacts and interconnections in ics is

Answer 1

Poly-silicon and silicides are used in IC's for contacts and interconnection.

IC's work on the semiconductor material, since semiconductor are made up by doping of different valance electron into silicon, that's why contact point of IC's and  interconnection are mainly made up of Poly-silicon and silicides.

Aluminium, copper, tungsten also use for interconnection material.