Flexible ambipolar organic field-effect transistors with reverse-offset-printed silver electrodes for a complementary inverter

Junsu Park, Minseok Kim, Seung Won Yeom, Hyeon Jun Ha, Hyenggun Song, Young Min Jhon, Yun Hi Kim, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We report ambipolar organic field-effect transistors and complementary inverter circuits with reverse-offset-printed (ROP) Ag electrodes fabricated on a flexible substrate. A diketopyrrolopyrrole-based co-polymer (PDPP-TAT) was used as the semiconductor and poly(methyl methacrylate) was used as the gate insulator. Considerable improvement is observed in the n-channel electrical characteristics by inserting a cesium carbonate (Cs2CO3) as the electron-injection/hole-blocking layer at the interface between the semiconductors and the electrodes. The saturation mobility values are 0.35 cm2 V-1 s-1 for the p-channel and 0.027 cm2 V-1 s-1 for the n-channel. A complementary inverter is demonstrated based on the ROP process, and it is selectively controlled by the insertion of Cs2CO3 onto the n-channel region via thermal evaporation. Moreover, the devices show stable operation during the mechanical bending test using tensile strains ranging from 0.05% to 0.5%. The results confirm that these devices have great potential for use in flexible and inexpensive integrated circuits over a large area.

Original languageEnglish
Article number225302
Issue number22
Publication statusPublished - 2016 Apr 26

Bibliographical note

Funding Information:
This work was partly supported by Institute for Information and Communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) (B0101-16-0133, the core technology development of light and space adaptable energy-saving I/O platform for future advertising service) and Korea Evaluation Institute of Industrial Technology (KEIT) grant funded by the Korea government (MOTIE) (10048317, Development of red and blue OLEDs with external quantum efficiency over 20% using delayed fluorescent materials). The work was also supported by the KSSRC program (Stretchable Multi Sensor for Wearable IoT Device).

Publisher Copyright:
© 2016 IOP Publishing Ltd.


  • ambipolarity
  • complementary inverter
  • field-effect transistors
  • organic semiconductor
  • printed electronics
  • reverse offset printing

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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