Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.37: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1C
Secondary phase investigation on kesterite materials using X-ray absorption spectroscopy — •Konrad Ritter1, Sergio Giraldo2, Galina Gurieva3, Laura Elisa Valle Rios3, Götz Schuck3, Edgardo Saucedo2, Susan Schorr3,4, and Claudia S. Schnohr1 — 1Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1 08930, Sant Adrià de Besòs, Barcelona , Spain — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Department Crystallography, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 4Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
Cu2ZnSnSe4 based kesterites offers a wide range of promising absorber materials for photovoltaics, but the record efficiency has only reached 12.6% yet. One of the limiting factors seems to be the formation of secondary phases throughout the preparation process. Therefore we used X-ray absorption near edge structure spectroscopy for an element specific detection of secondary phases via linear combination fitting. Kesterite powder samples created by solid state reaction with varying compositions were studied, to better understand the phase formation depending on the initial material composition. Furthermore, kesterite solar cells with and without small amounts of Ge were studied for different stages of preparation. The presence of Ge greatly improves the device performance and a detailed phase analysis will help to understand the underlying absorber formation mechanisms.