Template-mediated nano-crystallite networks in semiconducting polymers

Sooncheol Kwon, Kilho Yu, Kyoungchun Kweon, Geunjin Kim, Junghwan Kim, Heejoo Kim (), Yong-Ryun Jo, Bong-Joong Kim, Jehan Kim, Seoung Ho Lee and Kwanghee Lee ()
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Sooncheol Kwon: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Kilho Yu: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Kyoungchun Kweon: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Geunjin Kim: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Junghwan Kim: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Heejoo Kim: Heeger Center for Advanced Materials (HCAM), Gwangju Institute of Science and Technology (GIST)
Yong-Ryun Jo: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Bong-Joong Kim: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)
Jehan Kim: Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH)
Seoung Ho Lee: Heeger Center for Advanced Materials (HCAM), Gwangju Institute of Science and Technology (GIST)
Kwanghee Lee: Gwangju Institute of Science and Technology (GIST), School of Materials Science and Engineering (SMSE)

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract Unlike typical inorganic semiconductors with a crystal structure, the charge dynamics of π-conjugated polymers (π-CPs) are severely limited by the presence of amorphous portions between the ordered crystalline regions. Thus, the formation of interconnected pathways along crystallites of π-CPs is desired to ensure highly efficient charge transport in printable electronics. Here we report the formation of nano-crystallite networks in π-CP films by employing novel template-mediated crystallization (TMC) via polaron formation and electrostatic interaction. The lateral and vertical charge transport of TMC-treated films increased by two orders of magnitude compared with pristine π-CPs. In particular, because of the unprecedented room temperature and solution-processing advantages of our TMC method, we achieve a field-effect mobility of 0.25 cm2 V−1 s−1 using a plastic substrate, which corresponds to the highest value reported thus far. Because our findings can be applied to various π-conjugated semiconductors, our approach is universal and is expected to yield high-performance printable electronics.

Date: 2014
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DOI: 10.1038/ncomms5183

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