Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.36: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Optical Imaging of Cu(In,Ga)Se₂ Solar Cells with Consideration of Material Homogeneity as a Quality Control Tool for Photovoltaic Devices — •Steffen Kretzschmar, Oliver Nagel, Dieter Greiner, Christian A. Kaufmann, and Thomas Unold — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin

The luminescence yield of Cu(In,Ga)Se₂ solar cells or absorber layers can be used as a quality control indicator of the photovoltaic performance, in particular the open circuit voltage, of these devices. Here we present a study of electroluminescence and photoluminescence imaging on Cu(In,Ga)Se₂ solar cells using an InGaAs detection system with a good spectral match to the chalcopyrite luminescence emission. The results are compared to current-voltage and external quantum efficiency analyses on the same devices. In accordance with theory we find a linear dependence of the open circuit voltage on the logarithm of the luminescence yield. However, when not taking lateral inhomogeneities into account, a large spread in the correlation of solar cell parameters to imaging results is observed. We find that using an analytical homogeneity correction model leads to a distinct improvement of the correlation between the luminescence data and the device parameters open-circuit voltage and conversion efficiency which allows the use of luminescence imaging as a predictive tool for inline monitoring and quality control.