How important is the back reaction of electrons via the substrate in dye-sensitized nanocrystalline solar cells?

Article Abstract:

The role of the conducting glass substrate (fluorine-doped tin oxide, FTO) in the back reaction of electrons with tri-iodide ions in dye-sensitized nanocrystalline solar cells (DSCs) was investigated using thin layer electrochemical cells that are analogues of the DSCs. The results show that this back-reaction route cannot be neglected in DSCs, particularly at lower light intensities, where it is the dominant route for the back transfer of electrons to tri-iodide.

Tin compounds, Substrates

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Characterization of titanium dioxide blocking layers in dye-sensitized nanocrystalline solar cells

Article Abstract:

The properties of thin blocking layers of titanium dioxide used to improve the performance of dye-sensitized nanocrystalline solar cells are discussed. The results show that the ability of the blocking layer to prevent the back reaction of electrons with tri-iodide ions in the electrolyte is excellent under short circuit conditions, but is limited under open circuit conditions by electron accumulation at the surface of the titanium dioxide blocking layer.

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Band-edge tuning in self-assembled layers of Bi(sub 2)S(sub 3) nanoparticles used to photosensitize nanocrystalline TiO3

Article Abstract:

Self-assembled layers of Bi(sub 2)S(sub 3) nanoparticles are used to sensitize nanocrystalline titanium dioxide, replacing the ruthenium dye used in conventional dye-sensitized solar cells. The results suggest that band-edge tuning might form a useful part of strategies designed to exploit semiconductor quantum dots as sensitizers.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Bismuth, Photosensitizing compounds, Photosensitizing agents

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