Charyton M.K., Crêpellière J., Kotwica K., Gora M., Le W., Frache G., Grysan P., Guillot J., Baba K., Boscher N.D.
Journal of Materials Chemistry C, vol. 12, n° 30, pp. 11368-11377, 2024
Low band gap benzothiadiazole-oligothiophene conjugated polymer thin films are prepared using oxidative chemical vapor deposition (oCVD). The synthesis and deposition occur simultaneously from the gas phase in oCVD; no solubilizing groups are attached to the benzothiadiazole or thienyl moieties, which allows molecular packing and charge carrier mobility to increase. Moreover, oCVD, which is a solventless, scalable and substrate independent approach, readily leads to the formation of dense and low surface roughness benzothiadiazole-oligothiophene conjugated polymer thin films. Polymerization yield, doping and conductivity of the benzothiadiazole-oligothiophene conjugated polymers are shown to be strongly influenced by the oxidant-to-monomer ratio. Interestingly, benzothiadiazole-oligothiophene conjugated polymer thin films synthesized by oCVD exhibit hole mobilities up to 4.0 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, surpassing those of previously reported benzothiadiazole-oligothiophene conjugated polymers prepared by spin-coating, dip-coating and drop casting.
