  In this paper we present exact solutions to the so-called Elko spinors for
three models of expanding universe, namely the de Sitter, linear and the
radiation type evolution. The study was restrict to flat, homogeneous and
isotropic Friedmann-Robertson-Walker backgrounds. Starting with an Elko spinor
we present the solutions for these cases and compared to the case of Dirac
spinors. Besides, an attempt to use Elko spinors as a dark energy candidate in
the cosmological context is investigated.
