Donor-acceptor optoelectronic molecules based on hexa-peri-hexabenzocoronene and benzothiadiazole units: effect of different combinations.

Three donor-acceptor (D-A) conjugated molecules using hexa-peri-hexabenzocoronene (HBC) as D unit while benzo[2,1,3]thiadiazole (BT) as A unit have been synthesized. They have different D-A combination fashions, including D-A, A-D-A and D-A-D. Their thermal, optical, electrochemical properties and molecular interactions have been thoroughly studied, with particular attention paid on the effect of different D-A combinations. Property comparison reveals that the ADA molecule using HBC as core and two BT units as arms possesses a better light absorption property and a more ordered film structure than the other two. Finally, such ADA molecule displayed the best field-effect transistor and photovoltaic performances. [ABSTRACT FROM AUTHOR]