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Room‐Temperature Self‐Organizing Characteristics of Soluble Acene Field‐Effect Transistors
Author(s) -
Lee Wi Hyoung,
Lim Jung Ah,
Kim Do Hwan,
Cho Jeong Ho,
Jang Yunseok,
Kim Yong Hoon,
Han Jeong In,
Cho Kilwon
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701087
Subject(s) - materials science , crystallinity , organic semiconductor , semiconductor , acene , field effect transistor , spin coating , thin film , nanotechnology , transistor , molecule , optoelectronics , composite material , organic chemistry , chemistry , voltage , physics , quantum mechanics
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.