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Jpn. J. Appl. Phys. 51 (2012) 055802 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Optical and Transport Anisotropy in Poly(9,9'-dioctyl-fluorene-alt-bithiophene) Films Prepared by Floating Film Transfer Method

Arnaud Dauendorffer, Shuichi Nagamatsu1, Wataru Takashima2, and Keiichi Kaneto

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan
1Department of Computer Science and Electronics, Kyushu Institute of Technology, Iizuka, Fukuoka 820-8502, Japan
2Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan

(Received December 13, 2011; revised February 8, 2012; accepted March 2, 2012; published online April 19, 2012)

We demonstrated the fabrication of self-aligned poly(9,9'-dioctyl-fluorene-alt-bithiophene) copolymer (F8T2) thin films at ambient temperature with a new solution-process technique named floating film transfer method (FTM). Atomic force microscope topography and polarized absorption spectroscopy showed that the polymer main chains aligned perpendicularly to the film propagation direction during the fabrication process. FTM films presented absorption dichroic ratios slightly below 3. Top-contact/bottom-gate field effect transistors made with FTM films exhibited anisotropic transport properties with a hole mobility along the aligned direction of F8T2 main chains of 2.2×10-3 cm2/(V·s), which was around 2.5 times greater than that along the perpendicular direction. Dichroic and transport anisotropy ratios were further enhanced up to 7–8 by thermal annealing, although the mobility improvement remained limited due to possible trapping effect at domain boundaries.

URL: http://jjap.jsap.jp/link?JJAP/51/055802/
DOI: 10.1143/JJAP.51.055802


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