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Ultrafast Electron Injection from the S2 State of Carotenoids into TiO2 Nanoparticles

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Dye molecules attached to TiO2 nanoparticles have been of a great interest in the applications including dye-sensitized solar cells. In this paper, TiO2 nanoparticle sensitized with a natural photosynthetic dye, 8′-apo-β-caroten-8′-oic acid (ACOA) was investigated by femtosecond transient absorption spectroscopy. Ultrafast excited state dynamics of ACOA and electron injection and recombination dynamics between dye molecules and TiO2 nanoparticles were compared by changing the excitation wavelength between 403 and 480 nm. Ultrafast electron injection into TiO2 nanoparticles with quantum yields of 0.33 was observed for both excitation wavelengths.
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Keywords: Carotenoids; Dye-Sensitized Solar Cells; Excited-State Dynamics; Femtosecond Transient Absorption; Photoinduced Electron Injection

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea 2: Department of Physics and Photon Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea

Publication date: April 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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