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A novel concept “D‐A‐π‐A” organic sensitizer instead of traditional D‐π‐A ones is proposed. Remarkably, the incorporated low bandgap, strong electron‐withdrawing unit of benzothiadiazole shows several favorable characteristics in the areas of light‐harvesting and efficiency: i) optimized energy levels, resulting in a large responsive range of wavelengths into NIR region; ii) a very small blue‐shift...
We have developed dye-sensitized nanocrystalline TiO2 solar cells (DSSCs) based on organic-dye photosensitizers. DSSCs based on the organic dyes gave good performance of incident-photon-to-current conversion efficiencies in the range of 400 to 800 nm. Solar energy-to-electricity conversion efficiencies of up to 7.6% were obtained with DSSCs based on coumarin dyes (NKX-2677 and NKX-2883) under AM 1...
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