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Ultrahigh-speed fabrication of uniform polycrystalline thin films for organic transistors
Using the dip-coating method and liquid crystalline organic semiconductors, we have succeeded in achieving ultra-high speed (over 2.4 m/min) fabrication of crystalline films for organic transistors. This deposition speed is more than 2,000 times faster than the conventional deposition speed (less than 10 mm/min) by the solution process, which is a practical level.
The obtained crystalline films are uniform over on the whole substrate, and the bottom-gate bottom-contact transistors using these films show small variation among devices and high mobility (Ph-BTBT-10: 4.1 cm2/Vs, σ: 18 %). Furthermore, similar mobility was obtained for 250 transistors fabricated using crystalline films formed on a 10 cm square substrate.
While high speed fabrication of organic semiconductor films has been a touchstone for the practical application of electronics using printing technology, these results demonstrate that high speed fabrication is possible using a solution process, and are expected to greatly advance the practical application of low-cost RF-ID tags and IoT trilion sensors.
The research results were published in the electronic edition of the American Chemical Society ACS Applied Materials and Interface on June 22.
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