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Injection Limitations in a Series of Porphyrin Dye-Sensitized Solar Cells

Journal Article


Abstract


  • We report electron injection dynamics for a series of porphyrin sensitized nanocrystalline TiO2 films, comparing

    zinc and free base porphyrins with a conjugated or nonconjugated linker group to the carboxylate binding

    group. Injection dynamics are measured used time correlated single photon counting, using dye sensitized

    ZrO2 control films. These injection dynamics are correlated with molecular orbital calculations, electrochemical

    data and device photocurrent efficiencies. The injection dynamics, and overall injection efficiency is found to

    be increased by linker conjugation and by the use of a zinc central metal. The faster injection dynamics for

    the Zinc porphyrins is shown to be quantitative agreement with the higher singlet excited state energy of

    these dyes compared to free base porphyrins. For the most efficient dye studied, addition of a typical redox

    electrolyte to the dye sensitized film is observed to retard the injection dynamics. Moreover studies of sensitized

    ZrO2 control films indicated that the redox electrolyte resulted in a reduction of excited state lifetime, indicative

    of an additional decay pathway competing with electron injection. Overall, a close correlation is found between

    electron injection dynamics and photocurrent efficiency for this series of porphyrin sensitized solar cells,

    indicating that for such sensitizer dyes, electron injection is a key factor limiting device performance.

Publication Date


  • 2010

Citation


  • Santos, T. D., Morandeira, A., Koops, S., Mozer, A. J., Tsekouras, G., Dong, Y., Wagner, P. W., Wallace, G. G., Earles, J. C., Gordon, K. C., Officer, D. & Durrant, J. R. (2010). Injection Limitations in a Series of Porphyrin Dye-Sensitized Solar Cells. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 114 (7), 3276-3279.

Scopus Eid


  • 2-s2.0-77649148680

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5327

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 3276

End Page


  • 3279

Volume


  • 114

Issue


  • 7

Abstract


  • We report electron injection dynamics for a series of porphyrin sensitized nanocrystalline TiO2 films, comparing

    zinc and free base porphyrins with a conjugated or nonconjugated linker group to the carboxylate binding

    group. Injection dynamics are measured used time correlated single photon counting, using dye sensitized

    ZrO2 control films. These injection dynamics are correlated with molecular orbital calculations, electrochemical

    data and device photocurrent efficiencies. The injection dynamics, and overall injection efficiency is found to

    be increased by linker conjugation and by the use of a zinc central metal. The faster injection dynamics for

    the Zinc porphyrins is shown to be quantitative agreement with the higher singlet excited state energy of

    these dyes compared to free base porphyrins. For the most efficient dye studied, addition of a typical redox

    electrolyte to the dye sensitized film is observed to retard the injection dynamics. Moreover studies of sensitized

    ZrO2 control films indicated that the redox electrolyte resulted in a reduction of excited state lifetime, indicative

    of an additional decay pathway competing with electron injection. Overall, a close correlation is found between

    electron injection dynamics and photocurrent efficiency for this series of porphyrin sensitized solar cells,

    indicating that for such sensitizer dyes, electron injection is a key factor limiting device performance.

Publication Date


  • 2010

Citation


  • Santos, T. D., Morandeira, A., Koops, S., Mozer, A. J., Tsekouras, G., Dong, Y., Wagner, P. W., Wallace, G. G., Earles, J. C., Gordon, K. C., Officer, D. & Durrant, J. R. (2010). Injection Limitations in a Series of Porphyrin Dye-Sensitized Solar Cells. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 114 (7), 3276-3279.

Scopus Eid


  • 2-s2.0-77649148680

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5327

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 3276

End Page


  • 3279

Volume


  • 114

Issue


  • 7