Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

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

HL 92.13: Poster

Thursday, March 14, 2013, 16:00–20:00, Poster A

Evolution of the performance parameters of Cu(In,Ga)Se2 solar cells during light soaking at different temperatures — •Johannes Schoneberg, Jörg Ohland, Janet Neerken, Jan Keller, Jürgen Parisi, Maria Hammer, and Ingo Riedel — Department of Physics, University of Oldenburg, 26111 Oldenburg, Germany

Among all thin film photovoltaic technologies high-efficiency solar cells based on Cu(In,Ga)Se2 (CIGSe) absorber layers demonstrate the highest power conversion efficiencies around 20% . Metastabilities in device performance of CIGSe solar cells might lead to considerable light- or heat-induced variation of the solar cell parameters and therefore the efficiency. The fact that devices from different manufacturers exhibit more or less pronounced metastable behavior with different dynamics makes the topic interesting for a detailed analysis. A systematic study in which CIGSe solar the transient performance is monitored during light soaking, annealing and operation at different voltage bias will promote a more general understanding of the metastable device behavior. In this work CIGSe solar cells were light soaked at different light intensities and activation temperatures, while the performance parameters are monitored in a time series. From the results we intend to derive the activation energy between the relaxed and the light soaked states.