CARRIER MOBILITY IN ORGANIC SEMICONDUCTOR THIN FILMS
Dept. of ECE, University of Victoria, B.C., Canada
P.O. Box 3055, Victoria, B.C., Canada
Carrier mobility is an important parameter in determining device performance in
electronics and the values of the electron and hole mobilities for organic
semiconductor thin films are known to be rather low. This work studied some
reported data on electron and hole mobilities in the literature and analyzed them
using a barrier height modulation model and the better known "disorder" model .
Our results indicated that the physics behind the two models could be correlated and
both pointed to some limiting values pertaining to the localization of the carriers.
By comparing the results with an evaluation of the potential profiles across a given
cross section of the monomer backbone (for OC1C10PPV) with different subgroups, we
were able to deduce that the "localized" states were not directly associated with
the energy bands. This provides an opportunity to increase the carrier mobility to
its upper limit by applying a transverse bias
full paper (pdf, 104 Kb)