Abstract
A comparative study is reported of transient photoconductivity and ac conductivity in the liquid-crystalline columnar hexagonal () phase of pure and p-doped hexakis(n-hexyloxy)triphenylene. In both materials, charge-carrier transport is dispersive, and the measured carrier mobilities along the direction of the molecular columns are very similar, ∼1× . The dispersion arises from the intrinsic liquidlike disorder in the face-to-face packing of the triphenylene rings within the columns. Charge transport is found to be highly anisotropic (/∼). These results are discussed in terms of possible mechanisms for carrier transport in discotic liquid crystals.
- Received 21 February 1995
DOI:https://doi.org/10.1103/PhysRevB.52.13274
©1995 American Physical Society