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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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Influence of Simultaneous Tuning of Molecular Weights and Alkyl Substituents of Poly(thienoisoindigo-alt-naphthalene)s on Morphology and Change Transport Properties

Author(s)
Cho, Hye JinKang, Seok JuLee, Sang MyeonJeong, MingyuKim, GyoungsikNoh, Yong-YoungYang, Changduk
Issued Date
2017-09
DOI
10.1021/acsami.7b07856
URI
https://scholarworks.unist.ac.kr/handle/201301/22811
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.7b07856
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.36, pp.30755 - 30763
Abstract
To simultaneously assess the impact of molecular weight (Mn) and alkyl substituent variations of polymers on the structural and optoelectronic properties, herein, we conduct a systematic study of a series of poly(thienoisoindigo-alt-naphthalene) (PTIIG-Np)-based polymers containing different alkyl substituents (2-hexyldecyl (HD), 2-octyldodecyl (OD), and 2-decyltetradecyl (DT) chains) and Mn's (low (L) and high (H)). All of the polymers produce almost identical energy levels, whereas their optical spectra show a clear dependence on Mn's and the alkyl substituents. Interestingly, increasing the alkyl substituent sizes of the polymers steadily increases the lamellar d-spacings (d100), ultimately leading to a densely packed lamellar structure for PTIIGHD-Np. In addition, both H-PTIIGOD-Np and H-PTIIGDT-Np exhibit larger π-stacking crystallites than the corresponding low-Mn polymers, while for PTIIGHD-Np, their size increases in the low-Mn batch. Ultimately, L-PTIIGHD-Np shows the best hole mobility of 1.87 cm2 V-1 s-1 in top-gate and bottom-contact organic field-effect transistors (OFETs) with a poly(methyl methacrylate), which is nearly 1 order of magnitude higher than other polymers tested in this study. Our results demonstrate that the simultaneous Mn and alkyl substituent engineering of the polymers can optimize their film morphology to produce high-performance OFETs.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
alkyl side substituentscharge transport propertiesfield-effect transistorsmolecular weightsthienoisoindigo
Keyword
FIELD-EFFECT TRANSISTORSHIGH-PERFORMANCE AMBIPOLARPOLYMER SOLAR-CELLSTHIN-FILM TRANSISTORSCONJUGATED POLYMERSCHARGE-TRANSPORTHIGH-MOBILITYREGIOREGULAR POLY(3-HEXYLTHIOPHENE)ELECTRON MOBILITIESPRINTED TRANSISTORS

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