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Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster III

HL 90.5: Poster

Thursday, March 10, 2016, 16:00–19:00, Poster A

State-Filling Versus Screening of Electrostatic Potential Fluctuations in Cu2ZnSn(S,Se)4 thin-film solar cellsChristian Zimmermann1, Christoph Krämmer1, Mario Lang1, •Tobias Renz1, Tobias Abzieher2, Thomas Schnabel2, Erik Ahlswede2, Michael Powalla2,3, Christian Huber1, 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 — 3Light Technology Institute, KIT

Cu2ZnSn(S,Se)4 (CZTSSe) is a promising alternative for the well-established absorber material Cu(In,Ga)Se2 in thin-film solar cells. However, the efficiency of CZTSSe devices is still not competitive and essentially limited by an insufficient open-circuit voltage. Excitation power-dependent photoluminescence (PL) measurements show a “blue-shift“ of the PL maximum by 15–20 meV/decade. This is often explained by a screening of electrostatic potential fluctuations caused by charged defects. In literature, electrostatic potential fluctuations are often held accountable for the low VOC. In this contribution we investigate excitation-power dependent PL at 10K. We can show by analyzing the whole PL lineshape that the observed “blue-shift“ is rather dominated by filling of defect states than by a screening of electrostatic potential fluctuations.

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