Effective modulation of an aryl acetylenic molecular system based on dithienyldiketopyrrolopyrrole for organic solar cells

摘要: We report the synthesis and photovoltaic properties of two conjugated small-molecule acetylenic compounds based on a dithienyldiketopyrrolopyrrole (DT-DPP) core. In contrast with parent molecule in which DT-DPP core 9-(1-(3-dodecylthienyl)ethynyl)anthracen-10-yl endgroups are bridged through an bond, incorporating 1,4-phenylene moiety, connected to same via linkage, leads considerably enhanced power conversion efficiency (PCE). Specifically, lowering HOMO level resulting compound is supported by DFT calculation molecular structures, cyclic voltammetry experiments increased open-circuit voltage (Voc). Moreover, while lowest-energy absorption maximum blueshifted, this engineering produces strong broad visible, as well high mobility 4.50 × 10−4 cm2 V−1 s−1, thus contributing improve short-circuit current (Jsc), evidenced EQE measurements. The preliminary characterization solar cells engineered (ITO/PEDOT:PSS/acetylenic compound:PC61BM/Al) yielded PCE ≈5% Jsc = 9.24 mA cm−2, Voc 0.87 V, FF 63%, considerable significance view synthetic accessibility involving no high-boiling-point solvent additives or vapor annealing, whereas 3.86% was obtained for 8.18 0.73 64.6%. present result may provide simple approach modulating electronic organic semiconductors cells.