Slow Electron Injection on Ru−Phthalocyanine Sensitized TiO2

Photoinduced electron injection in dye sensitized TiO2 is a critical step in the function of dye sensitized solar cells. High electron injection quantum yields are a requirement to obtain efficient devices. While high electron injection quantum yields are usually linked to ultrafast electron-transfe...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2007-08, Vol.129 (30), p.9250-9251
Main Authors: Morandeira, Ana, López-Duarte, Ismael, Martínez-Díaz, M. Victoria, O'Regan, Brian, Shuttle, Chris, Haji-Zainulabidin, Nor A, Torres, Tomás, Palomares, Emilio, Durrant, James R
Format: Article
Language:English
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Summary:Photoinduced electron injection in dye sensitized TiO2 is a critical step in the function of dye sensitized solar cells. High electron injection quantum yields are a requirement to obtain efficient devices. While high electron injection quantum yields are usually linked to ultrafast electron-transfer dynamics (in the fs−ps timescales), the latter are not a requirement. We present here a system, Ru-phthalocyanine sensitized TiO2, where slow electron injection (k inj ≈ 450 ns-1) and efficient electron injection are compatible owing to the long lifetime of the injecting state, the Ru-phthalocyanine triplet state. Ru-phthalocyanine dyes are attractive sensitizers because they absorb strongly in the red and their axial ligands hinder the formation of aggregates.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja0722980