Effect of thiophene spacers in benzodithiophene‐based polymers for organic electronics |
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| Authors: | Taniya M S K Pathiranage Harsha D Magurudeniya Michael C Biewer Mihaela C Stefan |
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| Institution: | Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas |
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| Abstract: | Poly{2,6‐bis(thiophene‐2‐yl)‐4,8‐bis(5‐dodecylthiophen‐2‐yl)benzo1,2‐b :4,5‐b' ]dithiophene} poly(Th‐bDTBDT‐Th)] was successfully synthesized through Stille coupling polymerization. The addition of the thiophene spacer groups between the benzodithiophene units resulted in improved performance in optoelectronic devices. This was attributed to the reduced lamellae stacking distance in thin film with prominent π–π stacking peak indicating close assembly of poly(Th‐bDTBDT‐Th). Spacing between the benzodithiophene units in poly(Th‐bDTBDT‐Th) helped the close packing of dodecyl chains and generated improved π stacking interaction. For poly(Th‐bDTBDT‐Th), the measured average field effect mobility was 2.32 × 10?3 cm2 V?1 s?1 and average hole mobility in vertical direction was 2.92 × 10?5 cm2 V?1 s?1. Charge transport in both directions was improved by one order of magnitude with the presence of the thiophene spacer. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3942–3948 |
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| Keywords: | atomic force microscopy benzodithiophene conjugated polymers organic field effect transistors self‐assembly thin films |
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