Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 102: Sustainable photovoltaics with earth-abundant materials II (organized by DS)

HL 102.9: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, CHE 91

Raman investigation of Cu₂ZnSnSe₄ layers with and without preferential grain orientation — •Mario Lang¹, Christoph Krämmer¹, Johannes Sachs¹, Chao Gao¹, Sabine Schuster¹, Michael Powalla², Heinz Kalt¹, and Michael Hetterich¹ — ¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Light Technology Institute, KIT, and Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany

Cu₂ZnSnSe₄ (CZTSe) is attracting more and more attention as an alternative to the well-established Cu(In,Ga)Se₂ material system for thin-film photovoltaics due to its composition of earth-abundant elements. Raman spectroscopy is a powerful technique to detect secondary phases in the thin-film absorber layers. Futhermore, using polarization-dependent measurements it is possible to gain information on the crystal orientation when performed on samples with a preferential grain orientation. We present a comparative study of polycrystalline absorber layers with and without a preferential grain orientation. The results are analyzed using theoretical modeling of the Raman line intensities.