Journal
CHEMPHYSCHEM
Volume 15, Issue 6, Pages 1028-1032Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201301228
Keywords
absorber; dye-sensitized solar cells; electrochemistry; hybrid photovoltaics; metallocene
Funding
- Japan Society for the Promotion of Science (JSPS)
- Yazaki Memorial Foundation for Science and Technology
- Grants-in-Aid for Scientific Research [26810103] Funding Source: KAKEN
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A thin solid-state dye-sensitized photovoltaic cell is fabricated by composing organic and inorganic heterojunctions in which the visible-light sensitizers are cyclopentadiene derivatives (Cp*) coordinated to a metal oxide, typically TiO2. The coordination bonds of the metallocene molecular complex (Ti-Cp*) create a new LMCT (ligand-to-metal charge transfer) absorption band and induce a rectified charge transfer from the organic ligands to TiO2, leading to photocurrent generation. Photovoltaic junctions are completed by coating crystalline organic molecules (perylene) as a hole-transport layer on the Cp*-coordinated TiO2 surface by using the vapor deposition method. The molecular plane of Cp* on the TiO2 surfaces seems to help the hole-transport layer to form ordered structures, which effectively improve carrier conductivities and minimize interfacial resistance. The organic-inorganic hybrid thin-film photocell with metallocene molecular complexes is capable of generating high open-circuit voltages exceeding 1.2 V.
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