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Layer-by-Layer Fabrication of Multiple-Dye-Sensitized TiO2 Films for Dye-Sensitized Solar Cells by Vacuum Cold Spray

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Space-separate co-sensitization allows a more flexible design of dye sensitizers and promotes the development of high performance dye-sensitized solar cells, since the negative interactions between different dyes are minimized by the spatial seperation. The key point involves depositing nano-TiO2 particles on the dye-loaded TiO2 layer to form an efficient electron transport between the outer TiO2 layer and the inner dye-loaded layer. Layer-by-layer fabrication of multiple-dye-sensitized TiO2 films was realized through high velocity impact deposition by vacuum cold spray. Results show that the effective connection between the nano-TiO2 particles in the outer layer and the inner dye-loaded layer was realized through the high compressive pressure pulses resulting from the high velocity particle impact on deposit surface. It is found that the photovoltaic performance of the inner dye-loaded photoanode was not influenced by the deposition of the outer layer. A significant enhancement of photocurrent was obtained by space-separate co-sensitization of N719 dye and Black dye due to the effective connection between the outer layer and the inner dye-loaded layer.
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Keywords: CO-SENSITIZATION; DYE-SENSITIZED SOLAR CELLS; NANO-TIO2; PARTICLE CONNECTION; VACUUM COLD SPRAY

Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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