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Progress in Photovoltaics: Research and Applications

  • Photovoltaics

Quantitative Luminescence Mapping of Cu(In, Ga)Se2 Thin-Film Solar Cells

Authors Amaury Delamarre, Myriam Paire, Jean-François Guillemoles, and Laurent Lombez


We investigate photoluminescence and electroluminescence (PL and EL) emission images from Cu(In, Ga)Se2-based solar cells by means of a Hyperspectral Imager. Using the generalized Planck’s law, maps of the effective quasi-Fermi level splitting in absolute values are obtained. A good agreement is found between the spatially averaged splitting in PL and the global open-circuit voltage. However, from a local carrier transport discussion, we conclude that the equality does not hold locally. The spatial variations are rather attributed to local depth variations of the quasi-Fermi level splitting due to material properties spatial fluctuations. By comparing PL and EL emissions, we discuss qualitatively the local effective lifetimes and collection efficiencies.

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