Marked alkyl- vs alkenyl-substitutent effects on squaraine dye solid-state structure, carrier mobility, and bulk-heterojunction solar cell efficiency.

@article{Bagnis2010MarkedAV,
  title={Marked alkyl- vs alkenyl-substitutent effects on squaraine dye solid-state structure, carrier mobility, and bulk-heterojunction solar cell efficiency.},
  author={Diego Bagnis and Luca Beverina and Hui Huang and Fabio Silvestri and Y. C. Yao and Henry Yan and Giorgio A. Pagani and Tobin J Marks and Antonio Facchetti},
  journal={Journal of the American Chemical Society},
  year={2010},
  volume={132 12},
  pages={4074-5}
}
We report two new squaraine dyes substituted at the pyrrolic rings with n-hexyl (squaraine 1) or n-hexenyl (squaraine 2) chains. Although internal molecular structure variations are minimal, the presence of the terminal double bond results in a much more compact solid-state structure, dramatically affecting charge transport in the thin films; the hole mobility of 2 is approximately 5x that of 1, and the BHJ OPV power conversion efficiency (PCE) of 2 is approximately 2x that of 1. PCEs… CONTINUE READING
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