Bis(2-oxo-7-azaindolin-3-ylidene)benzodifuran-dione-based donor–acceptor polymers for high-performance n-type field-effect transistors. Issue 15 (30th March 2017) - Zhang, Guobing
Abstract : Two donor–acceptor (D–A) conjugated polymers were synthesized using a strongly electron-deficient unit as the acceptor, and dithiophene and ( E )-2-(2-(thiophen-2-yl)vinyl)thiophene as the donor units. Abstract : Two donor–acceptor (D–A) conjugated polymers, PBABDF-DT andPBABDF-TVT, were synthesized using a strongly electron-deficient unit, (3 E, 7 E )-3, 7-bis(6-bromo-1-(4-decyltetradecyl)-2-oxo-7-azaindolin-3-ylidene)benzo[1, 2- b :4, 5- b ′]difuran-2, 6(3 H, 7 H )-dione (BABDF ) as the acceptor, and dithiophene and ( E )-2-(2-(thiophen-2-yl)vinyl)thiophene as the donor units. Both polymers exhibited low LUMO energy levels (∼−4.0 eV) for marching with electron transport and displayed excellent n-type charge transport characteristics. The organic field-effect transistors exhibited the highest electron mobilities of 1.86 cm 2 V −1 s −1 and 1.56 cm 2 V −1 s −1 with high I on / I off ratios of 1.6 × 10 6 and 1.0 × 10 6 forPBABDF-DT andPBABDF-TVT, respectively. Both polymers had highly uniform polymer nanofibers, orderly lamellar crystalline structures, and close π–π stacking distances which all contributed to the high charge carrier mobility.