Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3421538
Keywords
dichroism; Langmuir-Blodgett films; liquid crystal polymers; paramagnetic resonance; thin films
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Funding
- MEXT, Japan [21740224, 22340080]
- JSPS Research Fellowships for Young Scientists
- Grants-in-Aid for Scientific Research [22340080, 21740224] Funding Source: KAKEN
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Ultrathin-film polymeric transistors with controlled in-plane chain orientation have been fabricated based on Langmuir-Blodgett technique by cospreading liquid crystal molecule with regioregular poly(3-hexylthiophene). The mobilities parallel to the chain direction reached 0.001-0.01 cm(2)/V s for 1 to 5 monolayer thick transistors. Mobility ratio was about 2 for the parallel and perpendicular directions. Electron spin resonance (ESR) signals of the field-induced polarons exhibited clear in-plane anisotropies due to unpaired pi-electrons. The anisotropic ESR spectra together with the optical dichroism determine the detailed molecular orientations in the channel of such ultrathin transistors.
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