Effect of heterocycles on field-effect transistor performances of donor-acceptor-donor type small molecules

Abstract

Two D–A–D small molecules comprising triphenylamine and diketopyrrolopyrrole were synthesized having either furan or thiophene connected to the fused lactam ring. In this design, furan/thiophene diketopyrrolopyrrole acts as an acceptor and triphenylamine acts as a donor. Propeller shaped triphenylamine has its effect on packing, processability and plays a vital role in determining the π-π molecular orbital stacking in such compounds and thus the mobility of charge carriers. With TDPPT and FDPPT, maximum hole carrier mobility obtained is 2.88×10−3cm2V−1s−1 and 1.60×10−3cm2V−1s−1, respectively using bottom gate bottom contact field-effect transistor.