Drift mobility of holes in phenanthrene single crystals

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Abstract
The temperature dependence of drift mobilities of holes in single crystals of phenanthrene was measured in the range 203–353°K in three crystallographic directions. Below the anomaly temperature of 72°C, the mobility temperature dependences are consistent with the Munn and Siebrand slow-phonon hopping process in the b direction and the Munn and Siebrand slow-phonon coherent mode in the a and c′ directions. The drift mobility temperature dependences in crystals that have been cooled through the anomaly temperature in the presence of illumination and an electric field are consistent with the model of Spielberg et al., in which the hindered vibration of the 4,5 hydrogens introduces a new degree of freedom above 72°C.