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| - Harvesting Infrared Photons with Croconate Dyes
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| Abstract
| - The excitons produced following the photoexcitation of the aggregates of a newly synthesized croconate dye undergo charge separation on an oxide surface. In a photoelectrochemical cell when these croconate dye aggregates adsorbed on TiO2 films are excited with visible−IR light they generate anodic current.
- Excited-state properties of the croconate dyes were investigated with an aim to utilize them as light harvesting assemblies in the infrared (IR) region (λmax ∼ 865 nm and M−1 c−1 = (1.4−4.2) × 105 M−1 s−1). The excited singlet of the monomeric dye quickly deactivates (lifetime 4−7 ps) without undergoing intersystem crossing to generate triplet. The triplet excited-state produced via triplet-triplet energy transfer method show relatively long life (lifetime 7.2 µs). The dye molecules when deposited as thin film on optically transparent electrodes or on nanostructured TiO2 film form H-aggregates with a blue-shifted absorption maximum around 660 nm. The excitons formed upon excitation of the dye aggregates undergo charge separation at the TiO2 and SnO2 interface. The H-aggregates in the film are photoactive and produce anodic current (IPCE of 1.2% at 650 nm) when employed in a photoelectrochemical cell. Spectroscopic and photoelectrochemical experiments that highlight the usefulness of croconate dyes in IR light harvesting applications are described.
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| - Harvesting Infrared Photons with Croconate Dyes
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