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Imaging Devices and Thin Film Semiconductor Materials

Imaging devices such as displays are electronic devices that allow people to perceive information, and therefore require thin film semiconductors with a large area, unlike conventional semiconductors such as IC chips. Thin-film semiconductors can be made of not only inorganic thin-film materials such as amorphous silicon, polysilicon, and oxide semiconductors, but also organic thin-film materials such as organic semiconductors.
Currently, amorphous organic semiconductor materials are being used in photoconductors for copiers and organic EL. Organic semiconductors, which can be used to fabricate thin-film semiconductors over a large area with low energy coating processes, are expected to be applied to other new electronic devices, but in particular, for the realization of thin-film transistors and organic integrated circuits, crystalline organic semiconductors with high mobility are preferred over amorphous materials with low mobility. In particular, for the realization of thin-film transistors and organic integrated circuits, crystalline organic semiconductor materials with high mobility are required rather than amorphous materials with low mobility. On the other hand, crystalline materials cannot be easily fabricated into flat and uniform thin films by conventional coating process.
Among such crystalline organic semiconductor materials, we are focusing on "liquid crystalline organic semiconductors" in which molecules aggregate and aligned on substrate in a self-organized manner.

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