Inhaltspezifische Aktionen

Dezember

Bild des Monats Dezember 2020

Hier finden Sie wechselnde Einblicke in die Arbeiten der am LaMa beteiligten Arbeitsgruppen. Eine Sammlung aller bisher erschienenen Bilder finden sie in der Galerie der Bilder des Monats.

Mg-doping yields Progress for ZnO-based Dye-sensitized Solar Cells

The image summarizes recent success in designing optimized semiconductors for dye-sensitized solar cells. Horizontal (vertical) arrows indicate the observed photocurrent (voltage), when Mg-doped ZnO nanoparticles that were prepared through wet-chemical synthesis with different Mg-content were used as photoanodes, sensitized by a dye and contacted by a redox electrolyte. The photovoltage was significantly increased by an upward shift of the quasi-Fermi level (and, presumably, of the conduction band edge) in the semiconductor. Electron transport was found to improve for low and worsen for higher Mg-concentrations. The recombination rate (represented by diagonal arrows) steadily increased with the amount of Mg. The superposition of these effects led to an increased cell performance for photoanodes, in which 5% of Zn was substituted by Mg (and to decreased performance for higher levels of doping).

Dieses Bild wurde eingereicht von Andreas Ringleb, AG Prof. Dr. Derck Schlettwein.