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HL: Fachverband Halbleiterphysik

HL 92: Poster Session: Structure and transport in organic photovoltaics; Photovoltaics; Impurities/Amorphous semiconductors; New materials

HL 92.14: Poster

Donnerstag, 14. März 2013, 16:00–20:00, Poster A

Investigation of defect energies of co-evaporated CIGSe solar cells — •Nils Neugebohrn, Maria S. Hammer, Christiane Stroth, Janet Neerken, Jan Keller, Jürgen Parisi, and Ingo Riedel — Energy and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg, 26111 Oldenburg, Germany

CuInGaSe₂ thin film solar cells are a promising candidate for the next generation low-cost and high efficiency solar cells. However, the relation between defect energies and the metastable/transient behavior of the performance is still an unsatisfyingly resolved issue. In CIGSe solar cells various anomalies are observed, which can provide insights in present defect dynamics, recombination mechanisms or possible transport barriers. Examples are the so called roll over and cross over effects in temperature dependent current-voltage characteristics (IV(T)) and shifting defect energies in deep level transient (DLTS) and admittance spectroscopy (AS(T)) depending on the conditioning of the solar cell prior to the measurement. In order to accurately investigate the impact of (pre-) conditioning, the defined initial or relaxed state of high efficiency CIGSe solar cells have been characterized by aforementioned methods. The results of this study and first results for cells in metastable conditions are presented.