Dye regeneration kinetics in dye-sensitized solar cells

Torben Daeneke, Atilla Janos Mozer, Yu Uemura, Satoshi Makuta, Monika Fekete, Yasuhiro Tachibana, Nagatoshi Koumura, Udo Bach, Leone Spiccia

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The ideal driving force for dye regeneration is an important parameter for the design of efficient dye-sensitized solar cells. Here, nanosecond laser transient absorption spectroscopy was used to measure the rates of regeneration of six organic carbazole-based dyes by nine ferrocene derivatives whose redox potentials vary by 0.85 V, resulting in 54 different driving-force conditions. It was found that the reaction follows the behavior expected for the Marcus normal region for driving forces below 29 kJ mol(-1) (Delta E = 0.30 V). Driving forces of 29-101 kJ mol(-1) (Delta E = 0.30-1.05 V) resulted in similar reaction rates, indicating that dye regeneration is diffusion controlled. Quantitative dye regeneration (theoretical regeneration yield 99.9 ) can be achieved with a driving force of 20-25 kJ mol(-1) (Delta E approximate to 0.20-0.25 V).
Original languageEnglish
Pages (from-to)16925 - 16928
Number of pages4
JournalJournal of the American Chemical Society
Issue number41
Publication statusPublished - 2012

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