Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.26: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1C

Electroreflectance studies of Cu(In,Ga)(S,Se)₂ solar cell absorber and buffer layers — •Jasmin Seeger¹, Oliver Kiowski², Michael Powalla^2,3, 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 (ZSW), 70565 Stuttgart, Germany — ³Light Technology Institute (LTI), KIT, 76131 Karlsruhe, Germany

Cu(In,Ga)(S,Se)₂ (CIGS) is one of the most promising thin-film solar cell absorber materials with demonstrated conversion efficiencies of up to 22.6% [1]. However, the commonly used CdS buffer still poses a problem due to the absorption losses in this layer. Further research into alternative buffer layers with less parasitic absorption, which enable even higher efficiencies, is therefore required. For that purpose we employ electro-modulated reflectance (ER) spectroscopy to study the CIGS absorber and CIGS/buffer interface for different fabrication conditions as well as absorber compositions and buffer materials.

[1] P. Jackson, R. Wuerz, D. Hariskos, E. Lotter, W. Witte, and M. Powalla. Effects of heavy alkali elements in Cu(In,Ga)Se₂ solar cells with efficiencies up to 22.6%, Phys. Status Solidi RRL 10(8), 583-586, 2016.