Flexible organic phototransistors based on a combination of printing methods

Minseok Kim, Hyun Jun Ha, Hui Jun Yun, In Kyu You, Kang Jun Baeg, Yun Hi Kim, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Highly photosensitive organic phototransistors (OPTs) are successfully demonstrated on a flexible substrate using all-solution process as well as a combination of printing methods which consist of roll-to-plate reverse offset printing (ROP), inkjet printing and bar coating. Excellent electrical switching characteristics are obtained from heterogeneous interfacial properties of the reverse-offset-printed silver nanoparticle electrode and the inkjet-printed p-channel polymeric semiconductor. In particular, the OPTs exhibit remarkably photosensitivity with a photo-to-dark current ratio exceeding 5 orders. This optoelectronic properties of the combinational printed OPTs are theoretically and experimentally studied, and found the comparable tendency. In addition, excellent mechanical stability is observed with up to 0.5% of strain applied to the OPTs. Hence, by manufactured with a combination of various graphic art printing methods such as roll-to-plate ROP, inkjet printing, and bar coating, these devices are very promising candidates for large-area and low-cost printed and flexible optoelectronics applications.

Original languageEnglish
Pages (from-to)2677-2684
Number of pages8
JournalOrganic Electronics
Issue number11
Publication statusPublished - 2014 Nov


  • Field-effect transistors
  • Organic phototransistors
  • Organic semiconductors
  • Printed electronics
  • Reverse offset printing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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