Distributed decay kinetics of charge separated state in solid film

Heli Lehtivuori, Alexander Efimov, Helge Lemmetyinen, Nikolai V. Tkachenko*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


Photoinduced electron transfer in solid films of porphyrin-fullerene dyads was studied using femtosecond pump-probe method. The relaxation of the main photo-product, intramolecular exciplex, was found to be essentially non-exponential. To analyze the decays a model accounting for a distribution of the free or reorganization energies is proposed. The model allows to fit the experimental data using three parameters: non-disturbed time constant, τ0, width of the energy distribution, ΔE, and sensitivity parameter, a = -(Δ G0 + λ0)/2λ0, where ΔG0 and λ0 are the average free and reorganization energies, respectively. The parameters were found to be τ0 = 50 ps, ΔE = 0.09 eV and a = 2 for the exciplex relaxation.

Original languageEnglish
Pages (from-to)238-242
Number of pages5
JournalChemical Physics Letters
Issue number4-6
Publication statusPublished - 2 Apr 2007


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