Effect of the second chromophore energy gap on photo-induced electron injection in di-chromophoric porphyrin-sensitized solar cells.

Energy levels of the di-chromophoric porphyrins An energy level diagram containing all the compounds obtained from the peak potentials in the DPV plots ( figure 2 ) is shown in figure 7 . The energy gap of the second organic chromophores shows a decreasing trend, from 2.99 eV of CbTPA to 2.52 eV of CbTh and to 1.93 eV of CbBTD ( figure 7 a ).

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