Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 30: Plasmonics and Nanooptics III
O 30.8: Talk
Tuesday, March 12, 2013, 12:15–12:30, H31
Coherent two-dimensional nanoscopy of nanotextured thin-film Si solar cells — Martin Aeschlimann1, Tobias Brixner2, Matthias Hensen3, •Christian Kramer2, Pascal Melchior1, Walter Pfeiffer3, Martin Piecuch1, Helmut Stiebig4, Christian Strüber3, and Philip Thielen1 — 1Fachbereich Physik and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany — 4Malibu GmbH & Co.KG, Böttcher Str.7, 33609 Bielefeld
The absorption of thin-film solar cells can be enhanced by increasing the effective light path in the absorptive layer via light trapping. We investigated amorphous thin-film Si solar cells with nanotextured internal interfaces by using coherent 2D nanoscopy. This technique combines coherent 2D spectroscopy with photoemission electron microscopy and enables a high spatial resolution below the optical diffraction limit. In our experiments we observed hot-spot photoemission from the Si layer and found line-shape variations of local 2D nanospectra obtained from different spots on the Si surface. These results are consistent with the formation of localized modes of multiply scattered radiation that are responsible for an increased absorption in the Si layer. Furthermore, we fit the measured 2D nanospectra with a damped Lorentzian-oscillator model and received the spatially-resolved information about lifetimes and spectral shifts of localized photonic modes.