Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 11: Poster Session I: Application of thin films; Ion beam induced surface patterns; Ion and electron beam induced processes; Micro- and nanopatterning (jointly with O)
DS 11.22: Poster
Montag, 11. März 2013, 17:00–20:00, Poster B1
Dewetting of silver films on Al-doped ZnO for plasmonic nanofilm formation — •Patrick Hofmann1, Mykola Vinnichenko2, Steffen Cornelius2, Barbara Abendroth1, Karl-Heinz Heinig2, Sibylle Gemming2, and Dirk-Carl Meyer1 — 1Institut für Experimentelle Physik, Leipziger Straße 23, 09599 Freiberg, Deutschland — 2Institut für Ionenstrahlphysik, Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Deutschland
Up to now all thin film solar cells exhibit only low efficiency around 6 to 8 %. This low value stems mainly from their thin absorbing layer; hence light management is a real challenge. One possibility to increase light absorption is the development of scattering mechanisms for light, which nears the backside of the solar cell and leads to an effective increase of the light path in the absorber. This work presents an approach to the fabrication of plasmonic Ag-Nanoparticles in ZnO:Al matrices by dc magnetron sputtering and subsequent dewetting treatment. For this purpose, both vacuum annealing and millisecond high power diode laser processing were tested. The dewetting of Ag layers is investigated by scanning electron microscopy. Depending on the processing parameters, the morphologies ranging from percolated network of islands to completely dewetted films were obtained. Spectral photometry in transmission and reflection showed stronger plasmonic features for laser annealed Ag-AZO composite layers in comparison with thermal vacuum annealed samples. The plasmonic effects become more pronounced with increasing laser power density and dwell time.