Journal
NATURE MATERIALS
Volume 12, Issue 7, Pages 659-664Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3595
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Funding
- US Department of Energy (DOE), Office of Basic Energy Sciences, as part of the Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center [DE-SC0000957]
- WCU (World Class University) programme through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-2008-000-10075-0]
- NSF [DMR 0644864]
- National Research Foundation of Korea [R31-2012-000-10075-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Conjugated polymers with a one-dimensional p-orbital overlap exhibit optoelectronic anisotropy. Their unique anisotropic properties can be fully realized in device applications only when the conjugated chains are aligned. Here, we report a molecular design principle of conjugated polymers to achieve concentration-regulated chain planarization, self-assembly, liquid-crystal-like good mobility and non-interdigitated side chains. As a consequence of these intra- and intermolecular attributes, chain alignment along an applied flow field occurs. This liquid-crystalline conjugated polymer was realized by incorporating intramolecular sulphur-fluorine interactions and bulky side chains linked to a tetrahedral carbon having a large form factor. By optimizing the polymer concentration and the flow field, we could achieve a high dichroic ratio of 16.67 in emission from conducting conjugated polymer films. Two-dimensional grazing-incidence X-ray diffraction was performed to analyse a well-defined conjugated polymer alignment. Thin-film transistors built on highly aligned conjugated polymer films showed more than three orders of magnitude faster carrier mobility along the conjugated polymer alignment direction than the perpendicular direction.
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