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HL: Fachverband Halbleiterphysik

HL 24: Joint Focussed Session: Thin Film Chalcogenide Photovoltaics III

HL 24.3: Talk

Monday, March 14, 2011, 16:30–16:45, GER 37

Analysis of Cu₂ZnSn(S/Se)₄ by Photoluminescence and Raman — •Rabie Djemour, Levent Gütay, and Susanne Siebentritt — Laboratory for Photovoltaics, University of Luxembourg

Kesterites Cu₂ZnSn(S/Se)₄ are promising absorber materials for low cost thin film photovoltaic devices, since they are composed of cheap, abundant, and non toxic materials. However, growing single phase Cu₂ZnSn(S/Se)₄, turns out to be a difficult task because of the very small existence region, as shown experimentally and theoretically. Thus, for proper optimization of the growth process of kesterites it is essential to detect the occurrence of any secondary phase. Since conventional X-ray diffraction and energy dispersive X-ray analysis are lacking unambiguous phase resolution, we perform photoluminsecence (PL) and Raman measurements, which allow for non-ambiguous identification of the kesterite and co-existing secondary phases. We present a homebuilt system that allows PL and Raman measurements at the same spot with a spatial resolution in the one micron range. We show and discuss characteristic PL spectra for kesterites of different composition and varying crystal quality and demonstrate that even single crystals show compositional and opto-electronic inhomogeneities.