Effects of electron withdrawing pendant groups on thiophene backbone-based polymers for organic thin-film transistors
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초록
내용
Two thiophene backbone-based p-type conjugated polymers with a benzodithiophenedione (BDD) moiety were synthesized with and without fluorination: fluorinated one (PF2-BDD) and non-fluorinated one (PT2-BDD). Both polymers were found to have planar backbones with efficient π conjugation, which can facilitate hole transports in organic thin-film transistors. By introducing fluorine atoms as pendant groups on the thiophene backbone, intra- and intermolecular dipole-dipole interactions (F···S and/or F···H) can be induced. As a result, PF2-BDD showed better backbone planarity and stronger intra- and intermolecular interactions than PT2-BDD. However, we found that PF2-BDD showed poorer hole mobilites than PT2-BDD, owing to solvent resistance, electron negativity, and random orientation. We think that our study can help to understand the relationship between the hole transport properties and molecular structures for designing thiophene-based p-type polymers with BDD moieties.