1256354-84-3Relevant academic research and scientific papers
Solution-processable star-shaped molecules with triphenylamine core and dicyanovinyl endgroups for organic solar cells
Zhang, Jing,Deng, Dan,He, Chang,He, Youjun,Zhang, Maojie,Zhang, Zhi-Guo,Zhang, Zhanjun,Li, Yongfang
, p. 817 - 822 (2012/02/15)
Two new star-shaped D-′-A molecules with triphenylamine (TPA) as core and donor unit, dicyanovinyl (DCN) as end group and acceptor unit, and 4,4′-dihexyl-2,2′-bithiophene (bT) or 4, 4′-dihexyl-2, 2′-bithiophene vinylene (bTV) as ′ bridge, S(TPA-bT-DCN) and S(TPA-bTV-DCN), were synthesized for the application as donor materials in solution-processed bulk-heterojunction organic solar cells (OSCs). The two compounds are soluble in common organic solvents, because of the three-dimensional structure of the TPA unit and the two hexyl side chains onthe bithiophene unit. S(TPA-bTV-DCN) film shows a broad absorption band from 360 to 750 nm. Absorption edge of S(TPA-bTV-DCN) film is red-shifted by ca. 78 nm than that of S(TPA-bT-DCN) film, benefitted from the vinylene bridges between TPA and bithiophene units in S(TPA-bTV-DCN). Power conversion efficiency (PCE) of the solution-processed bulk-heterojunction OSC based on a blend of S(TPA-bTV-DCN) and [6,6]-phenyl-C71-butyric acid methyl ester (1:2, w/w) reached 3.0% with a short circuit current density of 7.76 mA/cm2 and an open circuit voltage of 0.88 V, under the illumination of AM. 1.5, 100 mW/cm 2. In comparison, PCE of the OSC based on S(TPA-bT-DCN) as donor is 1.4% under the same experimental conditions. The PCE of 3.0% for S(TPA-bTV-DCN) is among the top values for the solution-processed molecule-based OSCs reported so far.
