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 journalArticle

5 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



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

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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