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Novel naphthalene-diimide-based small molecule with a bithiophene linker for use in organic field-effect transistors

Title
Novel naphthalene-diimide-based small molecule with a bithiophene linker for use in organic field-effect transistors
Author
장재영
Keywords
Organic field-effect transistors (OFETs); Naphthalene diimide (NDI); Rotatable bithiophene linker; n-type; Thermal annealing; Small molecules
Issue Date
2018-12
Publisher
ELSEVIER SCIENCE BV
Citation
ORGANIC ELECTRONICS, v. 63, page. 250-256
Abstract
We report on the synthesis and characterization of a novel naphthalene diimide (NDI)-based small molecule with a bithiophene linker unit, NDI-BT-NDI-EH, for application as a solution-processable n-channel active material in organic field-effect transistors (OFETs). NDI-BT-NDI-EH was synthesized via the Stille coupling reaction and the bithiophene linker unit was introduced as a rotatable linker between two NDI cores to improve the solubility of NDI-BT-NDI-EH while maintaining its high field-effect mobility. We found that the crystallinity and molecular ordering of NDI-BT-NDI-EH thin films could be improved by thermal annealing; a moderate annealing temperature of 120 degrees C appeared to be optimal for promoting self-organization among the NDI-BT-NDI-EH molecules. The NDI-BT-NDI-EH molecules in thermally annealed thin films mainly adopted an edge-on orientation with improved pi-pi stacking on the surface of octyltrichlorosilane-treated SiO2 substrates, which is favorable for lateral charge transport. As a result, the optimally annealed NDI-BT-NDI-EH OFET exhibited evident n-type OFET characteristics with high field-effect mobilities of up to 0.016 cm(2) V-1 s(-1) and an on/off ratio of 1.4 x 10(5).
URI
https://www.sciencedirect.com/science/article/pii/S1566119918305020?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/120907
ISSN
1566-1199; 1878-5530
DOI
10.1016/j.orgel.2018.09.037
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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