High-speed blade-coating using liquid crystalline organic semiconductor Ph-BTBT-10

Abstract

We have investigated the fabrication of crystalline thin films of a liquid crystalline organic semiconductor (2-decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene: Ph-BTBT-10) by high-speed blade-coating at 140 mm s ^−1 . Uniform crystalline Ph-BTBT-10 films were fabricated at temperatures over 50 °C, which is the temperature of the liquid crystal phase, without inhomogeneous recrystallization, despite the high-speed blade-coating. Transistors fabricated using these films showed a high average carrier mobility of 4.8 cm ^2 Vs ^−1 for 26 devices, with a coefficient of variation of only 7.3%. We concluded that liquid crystalline organic semiconductors are useful materials for high-speed meniscus-guided-coating for practical use.

Keywords

• organic thin film transistor
• Ph-BTBT-10
• blade-coating