AN ASSESSMENT OF THE ROLE OF POLARON FORMATION TO HOLE TRANSPORT IN ATRIARYLAMINE DOPED POLYMER

Hole mobilities have been measured in a doped polymer containing a tri arylamine compound with multiple donor functionalities. The results ar e compared to predictions of three-dimensional polaron models which in clude effects of nuclear tunnelling and disorder. The results show tha t polaron models cannot account for the field and temperature dependen cies of the mobility, particularly at low dopant concentrations and hi gh temperatures. Analytic approximations of the mobility in the presen ce of polaron formation and disorder show that for a large range of po laron binding energies, polaron formation has a limited effect on the field and temperature dependencies of the mobility.