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Carrier Transport Properties of Liquid Crystalline Organic Semiconductors

The carrier transport properties of liquid crystalline organic semiconductors are evaluated using the transient photocurrent measurement (Time-Of-Flight technique: TOF technique). By using the TOF technique, we can observe both hopping and ionic transports at the same time.
Furthermore, it is possible for liquid crystalline organic semiconductors to evalute the carrier transport properties in polycrystalline thin films, even thought it is normally difficult to evalute it by traps effect on giran boundaries. Its special property of liquid crystalline materials gives us to control the orientation of molecules easiliy in the liquid crystal phase and to make possible to reduce the effect of grain boundaries in the direction of the applied electric field because the crystal growth speed differs depending on the anisotropy of the molecular shape. In the case of terthiophene liquid crystals, which are rod-like liquid crystals, the mobility estimated by the TOF technique and the mobility obtained from the transfer characteristics of thin-film transistors are consistent, which indicats that the carrier transport is not significantly affected by traps on grain boundaries.
 H. Iino et al. Jpn. J. Appl. Phys. (2006).

We are now evaluating the carrier transport properties of Ph-BTBT derivatives, which can realize high mobility, by TOF technique and transistor characteristics.

• Imaging Devices and Thin Film Semiconductor Materials
• Liquid Crystalline Organic Semiconductors
• Developments of Liquid Crystalline Organic Semiconductors
• Carrier Transport Properties of Liquid Crystalline Organic Semiconductors
• Thin Film Fabrication Process Using Liquid Crystallinity
• Devices Using Liquid Crystalline Organic Semiconductors