  Dark energy is the candidate that can produce effective negative pressure and
make the galaxies and galaxy clusters move away from each other in an
accelerated way. The structures of the Universe have evolved from some initial
primordial fluctuations and depend on the background dynamics of different
components of the Universe like dark matter, dark energy and others. The
motivation of this thesis is to investigate how some of the dark energy models
manifest themselves in the formation of the structures in the Universe.
