Abstract
The mechanism of hole transport in amorphous polymers doped with various different molecules was studied by means of time-of-flight (TOF) photoconductivity measurements and molecular orbital calculations. It was found that diagonal and off-diagonal disorders which dominate the general features of charge transport are mainly caused by the spatially inhomogeneous distribution of charge on a dopant molecule. With an increase in the drift mobility, the structural relaxation of a dopant molecule between neutral and cation forms, the polaron formation, as well as disorder control the hopping rate.
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