Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Photovoltaics I

HL 6.2: Vortrag

Montag, 12. März 2018, 09:45–10:00, EW 203

The beneficial effect of Rubidium in Cu(In,Ga)Se2 solar cells — •Philipp Schöppe1, Sven Schönherr1, Roland Wuerz2, Wolfgang Wisniewski3, Gema Martínez-Criado4,5, Maurizio Ritzer1, Konrad Ritter1, Carsten Ronning1, and Claudia Sarah Schnohr11Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Stuttgart, Germany — 3Otto-Schott-Institut, Friedrich-Schiller-Universität Jena, Germany — 4Instituto de Ciencia de Materiales de Madrid, Spain — 5European Synchrotron Radiation Facility, Grenoble, France

Cu(In,Ga)Se2 solar cells are the most efficient ones among all thin film photovoltaics. The current world record efficiency was realized by applying a RbF post deposition treatment (PDT) to the absorber. However, it is not clear why the introduced Rb improves the solar cell performance. In order to investigate the beneficial effect of Rb, a Cu(In,Ga)Se2 absorber was grown on a Mo coated alkali free substrate and subjected to a RbF PDT. This pure RbF PDT leads to a significantly higher efficiency. A thin cross sectional lamella was cut out of the layer stack and investigated via a combination of electron microscopy and synchrotron based x-ray fluorescence analysis. This approach provides clear indications of the origin of the beneficial effect of Rb. It is evident that Rb segregates at random grain boundaries and dislocation cores, where it likely passivates defects. In contrast, Rb does not segregate at Σ3 twin boundaries. Additionally, Rb agglomerates at the interface between the absorber and the MoSe2 layer.

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