Journal
MACROMOLECULES
Volume 46, Issue 14, Pages 5657-5663Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma400852q
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Funding
- National Science Council, Taiwan [NSC 101-2623-E-007-013-IT]
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Poly(3-alkylthiophene)s (P3AT) are among the most widely used conjugated polymers for applications in polymer solar cells and thin-film transistors. In this study, the influence of the casting solvent on the conformational structure and fluorescence properties of the isolated chains of a regioregular and a regiorandom poly(3-hexylthiophene) (denoted by rr-P3HT and ra-P3HT, respectively) has been systematically investigated by single molecule spectroscopy. The isolated chains were dispersed in polystyrene matrix by casting from their ultraclilute solutions with tetrahydrofuran (THF) or toluene. ra-P3HT chains were found to contain mostly high-energy emitting species with short conjugating length, while the low-energy emitting sites existed predominantly in rr-P3HT chains irrespective of the casting solvent. The measurement of the modulation depth revealed that rr-P3HT chains cast from THF formed defect cylinder structure. The regioregular chains cast from toluene exhibited relatively regular folding to form rod structure as a result of the amplification of the segmental attraction in the poorer solvent. The casting solvent had insignificant effect on the conformational structure of ra-P3HT, where the isolated chains predominantly showed defect coil conformation irrespective of the casting solvent.
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