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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.28: Poster

Mittwoch, 22. März 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 (E_g = 1.0 eV) or pure sulphide CZTS (E_g = 1.5 eV) solar cell is not optimal for AM 1.5 radiation. To achieve an optimal value of approximately E_g = 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.