Journal
PHYSICAL REVIEW B
Volume 66, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.125107
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Photocurrent time-of-flight experiments are used to study the transport properties of hole-conducting nematic liquid crystals. Nondispersive transients are observed and a value of 4x10(-4) cm(2) V-1 s(-1) is found for the hole mobility of a chiral nematic glass at room temperature. The hole mobility of a reactive mesogen in the nematic glass phase is increased by photopolymerization of its reactive end chains to form an insoluble network. The mobility of the network shows a weak field dependence over the temperature range 295-373 K. The experimental data can be explained by hopping between the nematic cores using a Gaussian disorder model that includes spatial correlations in the carrier energy. The density-of-state distribution obtained from the model agrees with that measured spectroscopically.
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