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Article Abstract
Two polymers based on (3,7)-3,7-bis(2-oxoindolin-3-ylidene)benzo[1,2-:4,5-']difuran-2,6(3,7)-dione (BIBDF) coupled with ()-2-(2-(thiophen-2-yl)vinyl)thiophene (TVT) or dithienylbenzothiadiazole (TBT), namely PBIBDF-TVT and PBIBDF-TBT were synthesized the Stille coupling reaction. The effect of benzothiadiazole or vinylene-π spacer of the copolymers on optical properties, energy levels, electronic device performance and microstructure were studied. It was found that PBIBDF-TBT based OFET devices, annealed at 180 °C, showed better performance with the highest electron mobility of 2.9 × 10 cm V s whereas PBIBDF-TVT polymer exhibited 5.0 × 10 cm V s. The two orders of magnitude higher electron mobility of PBIBDF-TBT over PBIBDT-TVT is a clear indicator of the better charge transport ability of this polymer semiconductor arising from its higher crystallinity and better donor-acceptor interaction.
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| http://dx.doi.org/10.1039/c8ra08890j | DOI Listing |
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