10.1021/acsami.7b07856.s001
Hye Jin Cho
Hye Jin
Cho
Seok-Ju Kang
Seok-Ju
Kang
Sang Myeon Lee
Sang Myeon
Lee
Mingyu Jeong
Mingyu
Jeong
Gyoungsik Kim
Gyoungsik
Kim
Yong-Young Noh
Yong-Young
Noh
Changduk Yang
Changduk
Yang
Influence of Simultaneous Tuning of Molecular Weights
and Alkyl Substituents of Poly(thienoisoindigo-<i>alt</i>-naphthalene)s on Morphology and Change Transport Properties
American Chemical Society
2017
alkyl substituent engineering
Change Transport Properties
OD
M n batch
HD
M n polymers
M n
DT
OFET
alkyl substituent variations
alkyl substituent sizes
2017-08-21 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Influence_of_Simultaneous_Tuning_of_Molecular_Weights_and_Alkyl_Substituents_of_Poly_thienoisoindigo-_i_alt_i_-naphthalene_s_on_Morphology_and_Change_Transport_Properties/5368480
To
simultaneously assess the impact of molecular weight (<i>M</i><sub>n</sub>) and alkyl substituent variations of polymers on the
structural and optoelectronic properties, herein, we conduct a systematic
study of a series of poly(thienoisoindigo-<i>alt</i>-naphthalene)
(PTIIG-Np)-based polymers containing different alkyl substituents
(2-hexyldecyl (HD), 2-octyldodecyl (OD), and 2-decyltetradecyl (DT)
chains) and <i>M</i><sub>n</sub>’s (low (L) and high
(H)). All of the polymers produce almost identical energy levels,
whereas their optical spectra show a clear dependence on <i>M</i><sub>n</sub>’s and the alkyl substituents. Interestingly,
increasing the alkyl substituent sizes of the polymers steadily increases
the lamellar <i>d</i>-spacings (<i>d</i><sub>100</sub>), 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-<i>M</i><sub>n</sub> polymers, while for PTIIGHD-Np, their size
increases in the low-<i>M</i><sub>n</sub> batch. Ultimately,
L-PTIIGHD-Np shows the best hole mobility of 1.87 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup> 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 <i>M</i><sub>n</sub> and alkyl substituent engineering of the polymers
can optimize their film morphology to produce high-performance OFETs.