Slow Electron Injection on Ru−Phthalocyanine Sensitized TiO2

Morandeira Ramírez, Ana; López Duarte, Ismael; Martínez Díaz, María Victoria; O'Regan, Brian; Shuttle, Chris; Haji-Zainulabidin, Nor A.; Torres Cebada, Tomás; Palomares Gil, Emilio; Durrant, James Robert

Slow Electron Injection on Ru−Phthalocyanine Sensitized TiO2

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Official URL

https://doi.org/10.1021/ja0722980

Publication date

2007

Authors

Morandeira Ramírez, Ana

López Duarte, Ismael

Martínez Díaz, María Victoria

O'Regan, Brian

Shuttle, Chris

Haji-Zainulabidin, Nor A.

Torres Cebada, Tomás

Palomares Gil, Emilio

Durrant, James Robert

Publisher

American Chemical Society

Citations

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URI

https://hdl.handle.net/20.500.14352/100092

Citation

Morandeira A, López-Duarte I, Martínez-Díaz MV, O’Regan B, Shuttle C, Haji-Zainulabidin NA, et al. Slow Electron Injection on Ru−Phthalocyanine Sensitized TiO 2. J Am Chem Soc 2007;129:9250–1. https://doi.org/10.1021/ja0722980.

Abstract

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 (kinj ≈ 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.