pp. 487-496
S&M699 Research Paper of Special Issue Published: 2007 Fabrication of Direct-Printed OTFT Array Using Flexible h-PDMS Stamp [PDF] Jeongdai Jo, Taik-Min Lee, Jong-Su Yu, Chung-Hwan Kim, Dong-Soo Kim, Eung-Sug Lee and Masayoshi Esashi (Received May 8, 2007; Accepted September 7, 2007) Keywords: microcontact printing, direct printing, organic thin-film transistor, printed OTFT, h-PDMS stamp
Printed organic thin-film transistors (OTFTs) for use as a switching device in an organic light-emitting diode (OLED) were fabricated by microcontact and direct printing at room temperature. The printed OTFT was used in the fabrication of a printed gate with source and drain electrodes (W/L = 500 μm/5 μm, 500 μm/10 μm, and 500 μm/20 μm) printed using a hard poly (dimethylsiloxane) (h-PDMS) stamp and low-viscosity Ag ink, a spin coated parylene-C gate dielectric, and a soluble poly (3-hexylthiophene-2,5-dily) (P3HT) organic semiconductor on flexible, transparent poly(ethylenenaphthalate) (PEN) plastic substrates. The printed OTFT was characterized and the following parameters were obtained: a mobility of 0.06 (±0.02) cm2/Vs, an on/off current ratio of 103, and a subthreshold slope of 2.53 V/decade. Also, it was possible to fabricate a printed OTFT with channel lengths down to 5 μm, and reduce the fabrication process by 20 steps compared with photolithography.
Corresponding author: Eung-Sug LeeCite this article Jeongdai Jo, Taik-Min Lee, Jong-Su Yu, Chung-Hwan Kim, Dong-Soo Kim, Eung-Sug Lee and Masayoshi Esashi, Fabrication of Direct-Printed OTFT Array Using Flexible h-PDMS Stamp, Sens. Mater., Vol. 19, No. 8, 2007, p. 487-496. |