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A new star-shaped small molecule named TCNR3TTPA,with a triphenylamine(TPA)unit as the central building block and2-(1,1-dicyanomethylene)-3-octyl rhodanine(CNR)as the end-capped group,has been designed and synthesized.TCNR3TTPA showed a deep highest occupied molecular orbital(HOMO)energy level( 5.60 e V)and broad absorption.The solution-processed bulk heterojunction(BHJ)solar cells based on TCNR3TTPA:PC61BM(1:1,w/w)exhibited a high open-circuit voltage(Voc)of 0.99 V,a short-circuit current density(Jsc)of 5.76 m A/cm2,and a power conversion efficiency(PCE)of 2.50%under the illumination of AM 1.5 G,100 m W/cm2.The high Voc is ascribed to the strong electron-with-drawing ability of the end-capped 2-(1,1-dicyanomethylene)-3-octyl rhodanine group.These results demonstrated that the Voc of small-molecule organic solar cells could be increased by introducing a strong electron-withdrawing end-capped block,and that this is an effective strategy to design high-performance small molecules for organic solar cells.
A new star-shaped small molecule named TCNR3TTPA, with a triphenylamine (TPA) unit as the central building block and 2- (1,1-dicyanomethylene) -3-octyl rhodanine (CNR) as the end-capped group, has been designed and synthesized.TCNR3TTPA showed a deep highest occupied molecular orbital (HOMO) energy level (5.60 eV) and broad absorption.The solution-processed bulk heterojunction (BHJ) solar cells based on TCNR3TTPA: PC61BM (1: 1, w / w) a high open-circuit voltage (Voc) of 0.99 V, a short-circuit current density (Jsc) of 5.76 m A / cm2, and a power conversion efficiency (PCE) of 2.50% under illumination of AM 1.5 G, 100 m W / cm2. The high Voc is ascribed to the strong electron-with-drawing ability of the end-capped 2- (1,1-dicyanomethylene) -3-octyl rhodanine group. This result results that the Voc of small-molecule organic solar cells could be increased by introducing a strong electron-withdrawing end-capped block, and that this an effective strategy to design high-performance small molecules for org anic solar cells.