Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 5: Thin film photovoltaics: CIGSe + CdTe
DS 5.3: Talk
Monday, March 26, 2012, 10:30–10:45, H 2032
Investigation of the chlorine A-Center in polycrystalline CdTe layers by photoluminescence spectroscopy — •Christian Kraft1, Heiner Metzner1, Mathias Hädrich1, Pascal Schley2, and Rüdiger Goldhahn3 — 1Institut für Festkörperphysik, Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Institut für Physik, Technische Universität Ilmenau, 98684 Ilmenau, Germany — 3Institut für Experimentelle Physik, Universität Magdeburg, 39016 Magdeburg, Germany
Polycrystalline CdTe is a well known absorber material for thin film solar cells. However, the improvement of CdTe-based solar cells for industrial application is mainly based on empirical enhancements of certain process steps which are not concerning the absorber itself. Hence, the defect structure of CdTe is still not understood in detail. One of the most discussed defects in CdTe is the so called chlorine A-center. In general, the A-Center describes a defect complex of the intrinsic cadmium vacancy defect and an extrinsic impurity. By means of photoluminescence spectroscopy at temperatures of 5 K we investigated the behavior of the chlorine A-center under different CdTe activation techniques. Therefore, we were able to determine the electronic level of that defect and to analyze its influence on the crystal quality and the functionality of solar cells that were prepared of the corresponding samples.