Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.38: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1C
Composition - dependent atomic - scale structure of Cu2(Zn,Fe)SnS4 — •Cora Preiß1, Konrad Ritter1, Philipp Schöppe1, Susan Schorr2, and Claudia S. Schnohr1 — 1Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin und Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
The chalcogenides Cu2ZnSnS4 (kesterite) and Cu2FeSnS4 (stannite) are interesting as potential photovoltaic absorbers and provide a promising alternative to other solar cell materials. They offer advantages like the availability of the elements and their non-toxicity but the record efficiencies are still well below the theoretical prediction. In order to further improve the efficiency, a detailed knowledge of the fundamental material properties is needed. Cu2ZnSnS4, Cu2FeSnS4, and their solid solutions with different Zn/(Zn+Fe) ratios were investigated with extended X-ray absorption fine structure spectroscopy. The absorption at the K-edge of Cu, Zn, Sn and Fe was measured and is analyzed to reveal the bond length of the Cu, Zn, Sn and Fe atoms to their nearest S neighbors thus directly providing the different anion displacements. These results lead to a detailed understanding of the correlation between crystal structure and local atomic arrangements of this material system and show their impact on important material properties like the band gap energy.