Dragon-Boat-Type Heptathienoacenes: Synthesis, Structures, and Their Applications in OFETs

A novel synthetic strategy for efficient construction of dragon boat-type heptathienoacenes (DBHTs) via the alpha-beta position carbon-carbon cross-coupling between two dithienothiophenes is employed. Their crystal structures are confirmed by X-ray single-crystal analysis. The first thin film FET devices of heptathienoacenes are fabricated using OTS-treated SiO2/Si substrates, in which DBHT-5-based devices exhibit an unprecedented highest hole mobility value of 1.15 cm2 V-1 s-1 and on/off ratios over 106 with a threshold voltage of 0 V.

Automated summary

A novel synthetic strategy is employed to efficiently construct dragon boat-type heptathienoacenes through alpha-beta position carbon-carbon cross-coupling between two dithienothiophenes. The crystal structures are confirmed by X-ray single-crystal analysis. Thin film FET devices of heptathienoacenes are fabricated for the first time, with DBHT-5-based devices exhibiting unprecedented high hole mobility and on/off ratios, as well as a threshold voltage of 0 V.