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HL: Fachverband Halbleiterphysik

HL 10: Photovoltaics: Kesterites and less widely used materials (with DF)

HL 10.4: Vortrag

Montag, 16. März 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 Abzieher^1,2, 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 Cu_Zn+Zn_Cu. 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.