Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.39: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Plasmonically enhanced Grätzel cells for photovoltaics — •Jonas Schwenzer and Harald Giessen — 4th Physics Institute and Research Center SCOPE, University of Stuttgart, Germany

Dye sensitized solar cells are one of the most promising alternatives to silicon-based solar cells. Improvements on these cells were achieved by changing the different components e.g. the titania layer, the dye, or the electrolyte. The rather low stability of these cells was improved by solid state hole transport materials instead of liquid electrolytes. Another promising step to improve the output power are plasmonic Grätzel-cells with incorporated silica coated gold-nanoparticles. We blendend Au-SiO₂ nanoparticles with diameters of 150 nm and different shell sizes into the titania paste. The energy conversion efficiency was enhanced by 42% compared to cells with bare titania. Current voltage measurements showed that this enhancement is caused by an increase of the current while the open circuit voltage and the fill factor did not change significantly. Furthermore the study shows that the efficiency of the cell is higher if the silica shell is thinner. Another result of our work is the dependence of power conversion efficiency on the concentration of the nanoparticles.