Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 24, Pages 8345-8353Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03775
Keywords
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Funding
- Center for Advanced Soft-Electronics - Korean Government (MSIP) [2013M3A6A5073183]
- Basic Research Projects in High-tech Industrial Technology Project through GIST
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [NRF-2013M3C1A3065528]
- National Research Foundation of Korea (NRF) - MSIP [NRF-2014R1A2A2A01007159]
- European Research Council (ERC) under the European Union [638059]
- European Research Council (ERC) [638059] Funding Source: European Research Council (ERC)
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In this report, we investigate a formation mechanism for polymer chains aligned with various semiconductor polymers and a microstructure for directionally aligned film through systematic analysis that includes polarized UV-visible near infrared (UV-vis-NIR) absorption spectroscopy, atomic force microscopy, polarized charge modulation microscopy (p-CMM), and incident X-ray diffraction (GIXD) measurements. Through this study, we make two important observations: first, the highly aligned organic polymer semiconductor films are achieved by off-center spin coating of the preaggregated conjugated polymer solution. Second, the directionally aligned conjugated polymer films exhibit a larger anisotropy on the top surface compared with bulk film, which allows effective mobility improvement in top-gate/bottom-contact field-effect transistors with high performance uniformity. Finally, we demonstrate high-mobility organic field-effect transistors (OFETs) (7.25 cm(2)/(V s)) with a mobility large anisotropy (37-fold) using poly[(E)-1,2-(3,3'-dioctadecy1-2,2'-dithienyl)ethylene-alt-dithieno-(3,2-b:2',3'-d)thiophene] (P18) as the semiconductor layer.
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