@article{Delcamp:185535,
      title = {The Role of p Bridges in High-Efficiency DSCs Based on  Unsymmetrical Squaraines},
      author = {Delcamp, Jared H. and Shi, Yanrong and Yum, Jun-Ho and  Sajoto, Tissa and Dell'Orto, Elisa and Barlow, Stephen and  Nazeeruddin, Mohammad K. and Marder, Seth R. and Graetzel,  Michael},
      publisher = {Wiley-Blackwell},
      journal = {Chemistry-A European Journal},
      address = {Weinheim},
      number = {5},
      volume = {19},
      pages = {9. 1819-1827},
      year = {2013},
      abstract = {A series of squaraine-based sensitizers with various p  bridges and anchors were prepared and examined in  dye-sensitized solar cells. The carboxylic anchor group was  attached onto a squaraine dye through p bridges with and  without an ethynyl spacer. DFT studies indicate that the  LUMO is delocalized throughout the dyes, whilst the HOMO  resides on the squaraine core. The dye that incorporates a  4,4-di-n-hexyl-cyclopentadithiophene group that is directly  attached onto the p bridge, JD10, exhibits the highest  power conversion efficiency in a DSC; this result is  attributed, in part, to the deaggregative properties that  are associated with the gem-di-n-hexyl substituents, which  extend above and below the p-conjugated dye plane. Dye JD10  demonstrates a power-conversion efficiency of 7.3?% for  liquid-electrolyte dye-sensitized solar cells and 7.9?% for  cells that are co-sensitized by another metal-free dye,  D35, which substantially exceed the performance of any  previously tested squaraine sensitizer. A panchromatic  incident-photon-to-current-conversion efficiency curve is  realized for this dye with an excellent short-circuit  current of 18.0 mA?cm-2. This current is higher than that  seen for other squaraine dyes, partially owing to a high  molar absorptivity of >5?000?M-1?cm-1 from 400 nm to the  long-wavelength onset of 724 nm for dye JD10.},
      url = {http://infoscience.epfl.ch/record/185535},
      doi = {10.1002/chem.201202677},
}