Achieving High Alignment of Conjugated Polymers by Controlled Dip-Coating

Li, Qi‐Yi; Yao, Ze‐Fan; Lu, Yang; Zhang, Song; Ahmad, Zachary; Wang, Jie‐Yu; Gu, Xiaodan; Pei, Jian

doi:10.1002/aelm.202000080

Achieving High Alignment of Conjugated Polymers by Controlled Dip-Coating

Journal Article · Mon Apr 13 00:00:00 EDT 2020 · Advanced Electronic Materials

DOI:https://doi.org/10.1002/aelm.202000080· OSTI ID:1659423

Li, Qi‐Yi ^[1]; Yao, Ze‐Fan ^[2]; Lu, Yang ^[2]; Zhang, Song ^[3]; Ahmad, Zachary ^[3]; Wang, Jie‐Yu ^[2]; Gu, Xiaodan ^[3]; ^[2]

Peking Univ., Beijing (China); University of Southern Mississippi
Peking Univ., Beijing (China)
Univ. of Southern Mississippi, Hattiesburg, MI (United States)

Realizing high polymer chain orientation and ordered thin-film microstructures is beneficial for efficient charge transport of conjugated polymers. However, achieving a high alignment degree remains a challenge due to the sensitive nature of polymers to the processing conditions. By simply varying concentrations during a dip-coating method, the component of polymer aggregates that adopt the planar backbones is enlarged and the ensuing assembly process is promoted. Herein, highly oriented polymer thin films of an isoindigo-based conjugated polymer (PII-2T) are prepared to enhance polymer orientation resulting in a drastic booming in carrier mobilities of organic field-effect-transistors (OFETs). The maximum mobility from aligned polymer films increases by up to 8.3 cm² V^-1 s^-1, which is tenfold beyond the value evaluated from the unaligned direction or traditional spin-coated samples. The enhanced orientation can also reduce the adverse effects of the contact resistance and facilitate charge transport in transistors. This work demonstrates that the highly aligned conjugated polymer films can be approached by the dip-coating method while offers a latent cornerstone toward understanding the critical role of processing-related parameters in determining morphology of solution-coated thin films.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Southern Mississippi, Hattiesburg, MI (United States); Univ. of Southern Mississippi, Hattiesburg, MS (United States); University of Southern Mississippi, Hattiesburg, MS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0019361

OSTI ID:: 1659423

Alternate ID(s):: OSTI ID: 1635294
OSTI ID: 1774731
OSTI ID: 1985342

Journal Information:: Advanced Electronic Materials, Journal Name: Advanced Electronic Materials Journal Issue: 6 Vol. 6; ISSN 2199-160X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
alignment
carrier mobility
charge transport anisotropy
dip-coating
organic field-effect transistor

Achieving High Alignment of Conjugated Polymers by Controlled Dip-Coating

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