Plasmonic Dye-Sensitized Solar Cells

Plasmonic Dye-Sensitized Solar Cells
DSSC; surface plasmon; gold
Issue Date
2009 MRS Fall Meeting
Localized surface plasmon resonance (LSPR) is the electron oscillation in spatially confined small metallic nanoparticle coupled to an external electromagnetic field (e.g. light) and has been experimentally and theoretically demonstrated to enhance light absorption; thus, enable efficient light harvesting in the vicinity of the metal nanoparticles. Dye-sensitized solar cells (DSSCs) in which mesopourous and transparent semiconducting material (typically TiO2), sensitized with molecular dye is employed would be good candidates to apply LSPR to improve light harvesting efficiencies since metal nanoparticles would act as absorption amplifiers of dyes near the metal nanoparticles. In this study TiO2 films incoporated with gold nanoparticles were applied instead of TiO2 aiming at enhancing solar conversion efficiencies by virtue of the LSPR effect. To control the LSPR effect, various Au-TiO2 films with different size and density of gold nanoparicles were applied, and their light absorption and photoelectron generation behaviors were investigated. Notably, little difference in dye adsorption amount was observed in Au-TiO2 films compared with TiO2 films in the absence of gold nanoparticles. However, both light absorption and photoelectron generation were enhanced resulting in overall increase of photoconversion efficiencies. The details of the study will be discussed in the presentation.
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