Synthesis of isoindigo-based oligothiophenes for molecular bulk heterojunction solar cells

(Figure Presented) Isoindigo, as a new electron acceptor unit for organic electronic materials, was integrated into two low-energy gap oligothiophenes. Optical and electrochemical studies of the newly synthesized oligomers demonstrate broad absorption through the visible spectrum, along with appropriate energy levels, as desired for light harvesting donors for organic solar cells when blended with [6,6]-phenyl-C₆₁-butyric acid methyl ester (PC₆₀BM). Molecular heterojunction solar cells were fabricated using these oligomers and exhibit a power conversion efficiency up to 1.76% with a V_oc of 0.74 V, l_SC of 6.3 mA/cm² and fill factor of 0.38.