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Di-p-tolyl-p-nitrophenylamine (DTNA) is a highly polar donor molecule with a dipole moment of 5.78 D. Hole mobilities have been measured in DTNA doped poly(styrene) over a range of fields, temperatures, and DTNA concentrations. The results are described within the framework of a formalism based on disorder, due to Bassler and coworkers. In the disorder formalism, it is assumed that charge propagation occurs by hopping through a manifold of localized states with superimposed energetic and positional disorder. A key parameter of the formalism is the energy width of the hopping site manifold. For DTNA doped poly(styrene), the width is approximately 0.15 eV and independent of the intersite distance, or DTNA concentration. The width is described by a model based on dipolar disorder. The model is premised on the assumption that the width is determined by a dipolar component due to the DTNA molecule and a van der Waals component. The interpretation of the experimental results leads to the conclusion that the van der Waals component increases with increasing intersite distance.

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Hole mobilities have been measured in di‐p‐tolylphenylamine‐doped poly(styrene) containing 1‐phenyl‐3‐p‐diethylaminostyryl‐5‐p‐diethylamino‐phenylpyrazoline (DEASP), an 0.38 eV trap. For molar concentrations of less than a few multiples of 10−7, DEASP has no effect on the mobility. For concentrations in excess of 10−6, the mobility decreases with concentration as c−1.5. A concentration of 10−3 suppresses the trap‐free mobility by approximately 5 orders of magnitude. The results are described within the framework of a formalism due to Hoesterey–Letson and the recent simulations of Wolf et al. and Borsenberger et al. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 349–356, 1999