Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.32: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1C

Time resolved photoluminescence of Cu₂ZnSn(S,Se)₄ solar cell absorbers with varying composition — Mario Lang¹, Tobias Renz¹, Niklas Mathes¹, Markus Neuwirth¹, Thomas Schnabel², •André Schendel¹, Heinz Kalt¹, and Michael Hetterich^1,3 — ¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, 70565 Stuttgart, Germany — ³Light Technology Institute, KIT, 76131 Karlsruhe, Germany

Cu₂ZnSn(S,Se)₄ absorbers offer a huge potential for future thin-film solar cells. Up to now the low efficiency is predominantly caused by the low open circuit voltage V_OC compared to the theoretical possible V_OC. The reasons for the low open-circuit voltage are amongst others miscellaneous defects and secondary phases within the material. To suppress their formation absorber layers with off-stoichiometric Cu poor and Zn rich composition are used for highly efficient devices. In our contribution we analyze the effect of the composition on the radiative recombination by means of photoluminescence (PL) and especially time-resolved photoluminescence (TRPL).