Influence
of Side-Chain Regiochemistry on the Transistor
Performance of High-Mobility, All-Donor Polymers
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Abstract
Three novel polythiophene isomers
are reported whereby the only
difference in structure relates to the regiochemistry of the solubilizing
side chains on the backbone. This is demonstrated to have a significant
impact on the optoelectronic properties of the polymers and their
propensity to aggregate in solution. These differences are rationalized
on the basis of differences in backbone torsion. The polymer with
the largest effective conjugation length is demonstrated to exhibit
the highest field-effect mobility, with peak values up to 4.6 cm<sup>2</sup> V<sup>โ1</sup> s<sup>โ1</sup>