Date
Place
- Room C (Room 323)
- 24. Printable Transistors
- August 20, 2015 (Thursday)
- 09:00 ~ 10:30
- [24-2]
- 09:25 ~ 09:50
- Title:[Invited] Fabrication of Fully-Printed Short-Channel Organic Thin-Film Transistors
- Xu-Ying?Liu (NIMS, Japan), Masayuki?Kanehara (Colloidal Ink Co., Ltd., Japan), and Takeo?Minari (NIMS, Japan)
Abstract: Direct printing of organic thin-film transistors (OTFTs) using soluble organic semiconductors is a promising fabrication method that offers lower production costs, reduced energy consumption, and a smaller environmental burden. One of significant problems remained is limitation in decreasing the size of devices because of the poor resolution of current printing technologies. Thus it is one of the most significant challenges to fabricate short-channel devices based on printing techniques. We have developed the surface selective deposition method as the high-resolution printing technique, which permits the patterning of metal nanoparticle ink based on the surface wettability difference. The selected regions on hydrophobic polymer surface wettabilities were exposed to UV light through a photo mask, resulting in surface patterning into hydrophobic and hydrophilic regions. Then, the metal nanoparticle ink was applied to the surface to obtain the patterned metal electrodes. We employed a parallel UV light (wavelength of ~200 nm) as the light source, allowing us to reduce the lines and spaces of printed structures down to 1 mm. We have successfully fabricated fully-printed short-channel OTFTs using the surface selective deposition method. These results suggest that this fabrication method is very promising as a core technology for low-cost and high-performance printed electronics.
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