Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.28: Poster
Wednesday, March 22, 2017, 15:00–19:00, P1C
Effects of selenium-to-sulphur ratio in Cu2ZnSn(S,Se)4 absorbers for thin-film solar cells — •Elisabeth Seydel1, Markus Neuwirth1, Michael Wolf1, Lwitiko Mwakyusa1, Thomas Schnabel2, Erik Ahlswede2, Willi Kogler2, 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
Cu2ZnSn(S,Se)4 is a promising material system for thin-film solar cells as a substantial supply of all constituents is available. Yet the band gap of the resulting absorber of a pure selenide CZTSe (Eg = 1.0 eV) or pure sulphide CZTS (Eg = 1.5 eV) solar cell is not optimal for AM 1.5 radiation. To achieve an optimal value of approximately Eg = 1.3 eV our wet-chemically fabricated precursors are annealed in both selenium atmosphere and sulphur atmosphere. Hereby the ratio of Se and S and thus the band gap can be optimized to fit the solar spectrum best.