Probing interfacial electron transfer in coumarin 343 sensitized TiO 2 nanoparticles with femtosecond stimulated Raman

Renee R. Frontiera, Jyotishman Dasgupta, Richard A. Mathies

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

(Figure Presented) Femtosecond Stimulated Raman Spectroscopy (FSRS) is used as a structural probe of the interfacial electron transfer between Coumarin 343, a solar cell sensitizer, and TiO2 nanoparticles. Resonance Raman spectra of the charge-transfer complex reveals multiple vibrational motions, consisting primarily of carbon backbone and Ti-O binding modes, that direct the molecule out of the Franck-Condon region on the excited state potential energy surface. The vibrational spectrum and decay dynamics of the radical cation are also reported. These spectra indicate that the hole is localized on the conjugated carbon rings and that the donation mechanism involves multiple vibrational motions. We conclude with a discussion of prospects for improving the solar cell sensitization properties of Coumarin 343 through structural modification.

Original languageEnglish (US)
Pages (from-to)15630-15632
Number of pages3
JournalJournal of the American Chemical Society
Volume131
Issue number43
DOIs
StatePublished - Nov 4 2009

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