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High-mobility and air-stable organic thin-film transistors with highly ordered semiconducting polymer films

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3 Author(s)
Umeda, Tokiyoshi ; NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan ; Tokito, Shizuo ; Kumaki, Daisuke

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We report on high crystalline thin films of liquid-crystalline polythiophene derivative, poly(2,5-bis(3-hexadecylthiophene-2-yl)thieno[3,2-b]thiophene) (PB16TTT) that exhibit terrace structures and molecular steps of its polymer chains by annealing in its liquid-crystalline phase. The crystallinity of the PB16TTT polymer films formed on SiO2 gate insulating layers with smooth self-assembled monolayer was improved by changing the octyltrichlorosilane treatment time for the SiO2, which led to reproducible high field-effect mobilities of the polymer thin-film transistors up to 0.44 cm2/V s. High stability of the transistor for repeated stressing in ambient air was also demonstrated.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 5 )

Date of Publication:

Mar 2007

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