Abstract
A binary system of a polymer liquid crystal and a small molecular liquid crystal is expected to give a polymer-dispersed system in which the mesogenic compound makes appropriate domains for efficient charge transport. In this work, small molecular liquid crystalline semiconductor, 2,6-bis(5-nonylchieno)naphthalene (9TNAT9) which has highly ordered mesophase exhibiting high hole mobility in the order of 10-1 cm2V-1s-1, 1) and a polymer liquid crystalline semiconductor, regioregular poly(3-hexyl)thiophene (P3HT) were blended to see the phase separation, phase transition and drift carrier mobility. Interestingly, the blends exhibit high hole mobility comparable to that of 9TNAT9 and even in the low component ratio of 9TNAT9, the hole mobility is not decreased to the normal level of unaligned P3HT. The ionization potentials of these two compounds indicate the generated hole spontaneously goes to P3HT domains and thus, well-aligned P3HT may be formed by addition of small molecular liquid crystalline semiconductors.
