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Berlin 2015 – scientific programme

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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 61.30: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Investigation of order–disorder related band gap changes in Cu2ZnSn(S,Se)4 solar cells using electroreflectanceChristoph Krämmer1, Christian Huber1, Christian Zimmermann1, Mario Lang1, •Alexander Opolka1, Thomas Schnabel2, Tobias Abzieher1,2, Erik Ahlswede2, Heinz Kalt1, and Michael Hetterich11Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, 70565 Stuttgart, Germany

Cu2ZnSn(S,Se)4 (CZTSSe) has attracted attention in thin-film photovoltaics due to its similarity to the well-established Cu(In,Ga)(S,Se)2. However, the use of the low-cost and earth-abundant constituents Zn and Sn promise to overcome the weak point of the Cu(In,Ga)(S,Se)2 system, although up to now the gap in efficiency between these two systems could not be closed. Among other things a high amount of point defects is made responsible for this deficit. In this contribution we demonstrate reversible band gap shifts which are induced by post-annealing of finished CZTSSe solar cells and are attributed to changes in the disorder within the Cu–Zn lattice planes. These changes follow the stochastic Vineyard model which further predicts a critical temperature above which the kesterite structure is entirely Cu–Zn disordered.

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