Brønsted acidic tris(pentafluorophenyl)borane-water complex as a p-type dopant for highly conductive and stable organic thermoelectric via solution mixing
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Molecular doping acts as an important role to achieve superior thermoelectric (TE) properties of conjugated polymers. Film formation via mixed solution of the polymer and dopant provides a facile route to the uniform doping of quite thick polymer films appropriate for TE power generation. However, insufficient solubility of dopants hinders from high quality film formation. In this work, we study Brønsted acid doping effects of poly(3-hexylthiophene) (P3HT) with a tris(pentafluorophenyl)borane (BCF) which has great solubility. Interestingly, densly packed type II polymorph and planar quinoid conformation are formed upon the BCF doping. These properties help to facilitate chrage transport through the P3HT. Conclusively, the BCF doped P3HT films showed superior electrical and TE properties, which are more than an order of magnitudes higher compared to those of F4TCNQ doped P3HT films, with great air stability.