Hole mobilities have been measured in tri‐p‐tolylamine‐doped polymers as functions of the polymer composition, temperature, and electric field. Depending on the composition of the polymer, the mobilities vary by over two orders of magnitude. In all cases, the electric field and temperature dependencies can be described as exp(βE1/2) and exp−(T0/T)2, respectively. The effect of the host polymer on the mobility is largely related to the prefactor μ0. It is suggested that the dependence of μ0 on the polymer composition is related to the wave‐function overlap factor, 2αR, and due to differences of the ionization potential of the host polymer.
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