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DF: Fachverband Dielektrische Festkörper
DF 3: Photovoltaics: Kesterites and Less Widely used Materials (HL with DF)
DF 3.4: Talk
Monday, March 16, 2015, 12:00–12:15, ER 164
Effect of post-annealing on Cu2ZnSn(S,Se)4 solar cells studied by photoluminescence spectroscopy — •Christian Zimmermann1, Christoph Kraemmer1, Christian Huber1, Mario Lang1, Thomas Schnabel2, Tobias Abzieher1,2, Erik Ahlswede2, Heinz Kalt1, and Michael Hetterich1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany
In contrast to the established absorbers for thin-film solar cells such as Cu(In,Ga)Se2 and CdTe, thin-film solar cells based on kesterite absorbers like Cu2ZnSn(S,Se)4 (CZTSSe) require less toxic and scarce constituents. Recently it has been shown by Scragg et al., that a thermal processing can lead to a change in the ordering of the kesterite Cu–Zn planes (Appl. Phys. Lett. 104, 041911 (2014)), which could lead to a change in the density of the defect pair CuZn+ZnCu. The density and nature of intrinsic defects have a huge influence on the recombination characteristics of kesterites. Hence we use photoluminescence spectroscopy to investigate the influence of post-annealing of solar cells based on solution-processed CZTSSe. Our results lead to the conclusion, that electrostatic potential fluctuations still play a major role in CZTSSe solar cells regardless of the Cu–Zn ordering.