Highly sensitive, photocontrolled, organic thin-film transistors using soluble star-shaped conjugated molecules

Mi Yeon Cho, Su Jin Kim, Yoon Deok Han, Dong Hyuk Park, Kyung Hwan Kim, Dong Hoon Choi, Jinsoo Joo

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

The highly photosensitive characteristics of organic thin-film transistors (OTFTs) made using soluble star-shaped oligothiophenes with four-armed π-conjugation paths, 4(HPBT)-benzene and 4(HP3T)-benzene molecules having a relatively high quantum yield, are reported. 4(HPBT)-benzene-based organic phototransistors (OPTs) exhibited high photosensitivity (∼2500-4300 A W -1) even with low optical powers (∼6.8-30 μW cm-2) at zero gate bias. The measured photosensitivity of the devices was much higher than that of inorganic single-crystal Si-based phototransistors, as well as that of other OPTs reported earlier. With the highly photosensitive characteristics of the 4(HPBT)-benzene-based OPTs, a high ratio of the on and off current switching of ∼4 × 104 with low optical power and low gate bias was observed. The slow relaxation of the photoinduced charges and charge-trapping phenomena at the interface could lead to a reproducible memory operation for 4(HPBT)-benzene-based OPTs.

Original languageEnglish
Pages (from-to)2905-2912
Number of pages8
JournalAdvanced Functional Materials
Volume18
Issue number19
DOIs
Publication statusPublished - 2008 Oct 9

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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