  We have investigated the charge carrier transport in organic molecular
semiconductors. It has been found that mobility is a function of electric field
and temperature due to hopping conduction. Several theoretical models for
charge transport in disordered solids have been debated over the role of
spatial and energetic correlation in these systems and such correlations have
been recently shown to explain the universal electric field dependence of
mobility. We have compared and evaluated the applicability of different
theoretically proposed models using very simple experimental results and based
on our extensive analysis, we have found that correlation is important to
explain the electrical transport in these systems.
