Room-temperature self-organizing characteristics of soluble acene field-effect transistors

Wi Hyoung Lee, Jung Ah Lim, Do Hwan Kim, Jeong Ho Cho, Yunseok Jang, Yong Hoon Kim, Jeong In Han, Kilwon Cho

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We report on the room-temperature self-organizing characteristics of thin films of the organic small-molecule semiconductor triethylsilylethynyl- anthradithiophene (TES-ADT) and its effect on the electrical properties of TES-ADT-based field-effect transistors (FETs). The morphology of TES-ADT films changed dramatically with time, and the field-effect mobility of FETs based on these films increased about 100-fold after seven days as a result of the change in molecular orientation from a tilted structure in the as-prepared film to a well-oriented structure in the final film. We found that the molecular movement is large enough to induce a conformational change to an energetically stable state in spin-coated TES-ADT films, because TES-ADT has a low glass-transition temperature (around room temperature). Our findings demonstrate that organic small-molecule semiconductors that exhibit a low crystallinity immediately after spin-coating can be changed into highly crystalline structures by spontaneous self-organization of the molecules at room temperature, which results in improved electrical properties of FETs based on these semiconductors.

Original languageEnglish
Pages (from-to)560-565
Number of pages6
JournalAdvanced Functional Materials
Volume18
Issue number4
DOIs
Publication statusPublished - 2008 Feb 22

All Science Journal Classification (ASJC) codes

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

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