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Charge transport enhancement via air-mediated self-organization in polymer semiconductors

  • Takashi Kushida (a1), Takashi Nagase (a2) (a3) and Hiroyoshi Naito (a2) (a3)

Air-mediated molecular ordering in self-organized polymer semiconductors of regioregular poly(3-hexylthiophene) (P3HT) and poly[(9,9′-dioctylfluorenyl-2,7-diyl)-(2,2′-bithiophene-5,5′-diyl)] (F8T2) was investigated using organic field-effect transistors (OFETs) fabricated by transfer-printing using poly(dimethylsiloxane) stamps with various surface energies. OFET measurements revealed that the charge transport in the polymer semiconductors via the air interface layer was better than that via the substrate interface layer. The results indicated that the formation of a highly ordered microstructure at the polymer/air interface through air-mediated self-organization occurs in many polymer semiconductors. This air-mediated self-organization was weaker than substrate-mediated self-organization, whose influence appeared in OFETs with thin semiconductor films.

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