Synthesis, characterization, and photovoltaic properties of a low-bandgap copolymer based on 2,1,3-benzooxadiazole

摘要

PBDTBO, a conjugated polymer comprising benzo[ 1,2-6:4,5-b'ldithiophene (BDT) and 5,6-bis(octyloxy)benzo[c][l,2,5]-oxadiazole (BO) units, exhibits a deep HOMO energy level of -5.27 eV and excellent solubility. A device incorporating PBDTBO and [6,61-phenyl-C6i-butyric acid methyl ester (1:1, w/w) exhibited a power conversion efficiency of 5.7%. Thin film polymer solar cells (PSCs) based on bulk hetero-junction (BHJ) structures, prepared through solution processing, offer an opportunity for realizing low-cost renewable energy production.