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Efficiency enhancement in dye sensitized solar cells through co-sensitization of TiO2 nanocrystalline electrodes
5. K. Sayama, S. Tsukagoshi, T. Mori, K. Hara, Y. Ohga, A. Shinpou, Y. Abe, S. Suga, and H. Arakawa, Sol. Energy Mater. Sol. Cells 80, 47 (2003).
8. E. Palomares, J. N. Clifford, S. A. Haque, T. Lutz, and J. R. Durrant, Chem. Commun. 2002, 1464.
17.HOMO was estimated from the onset oxidation potential of the dye from cyclic voltammetery measurements using the relationship: EHOMO = −e(4.5 + Eonset) (eV) and LUMO was determined as: ELUMO = EHOMO − E0-0, the E0-0 transition energy was determined from the onset absorption energy.
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We have demonstrated that co-sensitization of TiO2electrode with an inexpensive rhodamine 19 perchlorate laser dye along with N3 dye not only enhances the incident-photon-to-current conversion efficiency but also reduces dark current. Consequently, the devices yield an average power efficiency of 4.7% as against 2.3% and 0.6% obtained for N3 and rhodamine 19 perchlorate dye based devices, respectively. The improvement in efficiency is attributed to the enhanced dye absorption on TiO2electrode as well as reduced dye aggregation that resulted from the usage of two dyes on different anchoring sites of single TiO2electrode.
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