can any one tell about the fabrication of ic's with respect to devlopement in semiconductors?

Answer 1

Sure.
As photolithographic techniques, deposition technigues, diffusion and dopant techniques, and things such as direct e-beam writing and doping improve, feature dimensions continue to be reduced and more active junctions get packed into the same (or less) amount(s) of real-estate.

HTH ☺

Doug