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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.31: Poster

Mittwoch, 18. März 2015, 15:00–20:00, Poster F

Photoluminescence investigation of the order–disorder effect in Cu₂ZnSn(S,Se)₄ solar cells — Christian Zimmermann¹, •Mario Lang¹, Christoph Krämmer¹, Thomas Schnabel², Tobias Abzieher^1,2, Angelika Schulz¹, 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

Due to its composition of low-cost and earth-abundant elements, Cu₂ZnSn(S,Se)₄ (CZTSSe) is a promising material system for thin-film photovoltaics. Yet, a lack of efficiency compared to the well-established thin-film technology Cu(In,Ga)(S,Se)₂ is present, and therefore further improvements have to be realized. Recently, an order–disorder transition accompanied by a band gap shift has been reported. In this contribution the influence of this transition on the photoluminescence spectra is investigated as a function of sample temperature and excitation power. The results are analysed with reference to the fluctuating potential model.