Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.47: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Calculation of gold nanoparticle-enhanced up-conversion intensity of Er3+ ions — •Deepu Kumar1, Florian Hallermann1, Stefan Fischer2, Alexander Sprafke3, Jan Christoph Goldschmidt2, and Gero von Plessen1 — 1Intitute of Physics (1A), RWTH Aachen University, 52056 Aachen, germany — 2Fraunhofer ISE, Heidenhofstr. 2, 79110 Freiburg, Germany — 3µMD Group, Institute of Physics, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany
The current generation process in conventional solar cells does not have any contribution from photons with energies lower than the silicon band gap (1.12 eV). Up-conversion processes, such as the excitation of electrons via sequential absorption of infrared photons in rare-earth ions, may be suited to exploit the near-infrared region of the solar spectrum. These processes lead to the conversion of two or more photons with low energy into one sufficiently high-energy photon that can be absorbed in silicon. We calculate the intensity enhancement of the up-conversion photoluminescence from a thin planar layer of Er3+ ions induced by a nearby gold nanosphere. We discuss the roles of the various excitation and decay processes involved in this enhancement.