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HL: Fachverband Halbleiterphysik
HL 34: Photovoltaics (joint session HL/CPP)
HL 34.3: Vortrag
Mittwoch, 3. April 2019, 15:30–15:45, H36
Spatially resolved composition and functionality of high efficiency Cu(In,Ga)Se2 thin film solar cells — •Christian Plass1, Maurizio Ritzer1, Philipp Schöppe1, Sven Schönherr1, Philip Jackson2, Roland Wuerz2, Claudia S. Schnohr1, and Carsten Ronning1 — 1Institut für Festkörperphysik, Friedrich- Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Stuttgart, Germany
Cu(In,Ga)Se2 solar cells yield one of the highest efficiencies among all thin film photovoltaics. Compositional variations of the absorber elements as well as incorporated alkali elements significantly affect the conversion efficiency. Hence there is a strong need to determine the composition spatially resolved.
High resolution synchrotron based methods like X-ray fluorescence analysis (XRF) and X-ray beam induced current (XBIC) enable insight into such compositional and functional variations. Simultaneous XRF and XBIC measurements of complete solar cells were conducted in plan-view geometry: The highly focused X-ray nanobeam at the ID16B-NA station of the European Synchrotron Radiation Facility scanned the solar cell and by analyzing the emitted X-Ray fluorescence radiation together with the corresponding induced current correlating maps are obtained. As the spatial resolution is about 50 nm, we can show how different elemental compositions, grains and grain boundaries influence the measured current.