Photoreactive π-conjugated star-shaped molecules for the organic field-effect transistor

Mai Ha Hoang, Min Ju Cho, Dae Cheol Kim, Kyung Hwan Kim, Ji Won Shin, Mi Yeon Cho, Jin soo Joo, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A number of semiconducting organic molecules capable of wet processing exhibit high carrier mobility and current modulation. In this work, we synthesized photopatternable π-conjugated star-shaped molecules and characterized their physical properties. The solubility of the synthesized molecules is very good for solution processing. The synthesized organic semiconducting multi-branched molecules are capable of photopatterning by virtue of photopolymerization of the reactive pentadienyl end groups. The transistor devices using these molecules provided a field-effect mobility of 1.3(±0.2) × 10-3-3.7(±0.5) × 10-3 cm2 V-1 s-1 as well as a high current on/off ratio (Ion/off > 103) and a low threshold voltage. In the case of the photoreactive star-shaped conjugated molecule HP2P, it was found that field-effect mobility was maintained even after the photocrosslinking process. This result can be used in the design of photopatternable semiconductor molecules for thin-film transistor electronic applications.

Original languageEnglish
Pages (from-to)607-617
Number of pages11
JournalOrganic Electronics
Issue number4
Publication statusPublished - 2009 Jul

Bibliographical note

Funding Information:
This research work was supported by 21st century Frontier Research Program (2008) and LG-display Co. Ltd. (2008). Particularly, M.J. Cho acknowledges the financial support by the Seoul R&BD Program (2008–2009).


  • Carrier mobility
  • Organic field-effect transistor
  • Photoreactive
  • Star-shaped molecule

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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