Fabrication of direct-printed OTFT array using flexible h-PDMS stamp

Jeongdai Jo, Taik Min Lee, Jong Su Yu, Chung Hwan Kim, Dong Soo Kim, Eung Sug Lee, Masayoshi Esashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)487-496
Number of pages10
JournalSensors and Materials
Issue number8
Publication statusPublished - 2007 Dec 1


  • Direct printing
  • Microcontact printing
  • Organic thin-film transistor
  • Printed OTFT
  • h-PDMS stamp

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)


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