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Bar-coated high-performance organic thin-film transistors based on ultrathin PDFDT polymer with molecular weight independence

Title
Bar-coated high-performance organic thin-film transistors based on ultrathin PDFDT polymer with molecular weight independence
Authors
Nketia-Yawson, BenjaminLee, Hyo-SangSon, Hae JungKim, BongSooNoh, Yong-Young
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2016
Journal Title
ORGANIC ELECTRONICS
ISSN
1566-1199JCR Link1878-5530JCR Link
Citation
vol. 29, pp. 88 - 93
Keywords
Organic thin-film transistorsBar-coatingConjugated polymersBenzothiadiazoleMolecular weightSolution process
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We report high-performance organic thin-film transistors (OTFTs) with an ultrathin active layer of difluorobenzothiadiazole-dithienosilole copolymer (PDFDT) form by using the wire bar-coating process. The top-gate/bottom contact (TG/BC) OTFTs based on bar-coated PDFDT polymer as channel material and poly(methyl methacrylate) (PMMA) as gate dielectric show a hole mobility of up to 2.2 cm(2) V-1 s(-1) with a current ON/OFF ratio (I-on/I-off) of 10(4)-10(5), with the mobility being two times larger than that of the spincoated PDFDT based OTFTs. The higher mobility of the bar-coated PDFDT polymer films can be attributed to the well-organized fibril structures of the polymer chains. Importantly, two different molecular weight polymers (M-n = 23 and 34 kDa) were employed to conduct these experiments and both batches showed about the same performance, which mitigates the typical batch-to-batch variation in OTFT performance. Furthermore, we explored the operational stability of the bar-coated OTFTs in ambient air and nitrogen environments. The bias-stress and cycling tests between the ON/OFF states of the bar-coated devices showed high stability in both nitrogen and air. Conclusively, here we demonstrate that (i) a simple barcoating process is a better method to control and obtain good polymer morphology in comparison to spin-coating, and (ii) the PDFDT polymer has great potential to provide good reproducibility and stability in large-area OTFT devices. (C) 2015 Elsevier B.V. All rights reserved.
DOI
10.1016/j.orgel.2015.11.033
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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