Optical and Transport Anisotropy in Poly(9,9'-dioctyl-fluorene-alt-bithiophene) Films Prepared by Floating Film Transfer Method

• Dauendorffer, Arnaud

• Nagamatsu, Shuichi

• Takashima, Wataru

• Kaneto, Keiichi

Abstract

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/(Vcenterdots), 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.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 51 (5), 055802-1-055802-6, 2012-04-19

  社団法人応用物理学会

Keywords

• General Physics and Astronomy
• Physics and Astronomy (miscellaneous)
• General Engineering

Details

• CRID: 1050564288864319232
• NII Article ID: 120005895879
• NII Book ID: AA12295836
• ISSN: 00214922
• ISSN: 13474065
• DOI: 10.7567/jjap.51.055802
• HANDLE: 10228/5952
• NDL BIB ID: 023673472
• Web Site: https://kyutech.repo.nii.ac.jp/records/4732
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023673472
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN