Thiophene backbone-based polymers with electron-withdrawing pendant groups for application in organic thin-film transistors
- Authors
- Jeong, Moon-Ki; Lee, Kyumin; Kang, Jinhyeon; Jang, Jaeyoung; Jung, In Hwan
- Issue Date
- Jun-2020
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NEW JOURNAL OF CHEMISTRY, v.44, no.22, pp.9321 - 9327
- Indexed
- SCIE
SCOPUS
- Journal Title
- NEW JOURNAL OF CHEMISTRY
- Volume
- 44
- Number
- 22
- Start Page
- 9321
- End Page
- 9327
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2053
- DOI
- 10.1039/d0nj01080d
- ISSN
- 1144-0546
- Abstract
- Two thiophene backbone-based hole-transporting polymers, namely, poly[(2,2′-bithiophene-5,5′-diyl)-alt-(5,7-bis(2-butyloctyl)-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione-1,3-diyl)] (PT2-BDD) and poly[(3,3′-difluoro-[2,2′-bithiophene]-5,5′-diyl)-alt-(5,7-bis(2-butyloctyl)-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione-1,3-diyl)] (PF2-BDD), were prepared by using electron-withdrawing pendant groups such as ketone and fluorine moieties. They both exhibited a planar backbone with efficient π conjugation, which is suitable for hole transport in organic thin-film transistors (OTFTs). However, the fluorinated one (i.e., PF2-BDD), despite its perfect backbone planarity and strong intra- and intermolecular interactions, could not enhance the OTFT performance; due to its solvent resistance, electron negativity, and random orientation, PF2-BDD showed 10 times lower hole mobility than the non-fluorinated polymer (i.e., PT2-BDD). Nonetheless, the two-dimensional grazing incidence X-ray diffraction and temperature-dependent absorption spectra of the synthesized polymers provided crucial information to understand the relationship between their hole transport behavior and molecular structure.
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