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Using micro-Raman spectroscopy, we demonstrate that the formation of the CuS binary phase in CISEL™ cells absorbers is highly determined by the presence of a Cu–Se binary phase in the precursors and depends on the Cu/In ratio. A selective sulphurization mechanism of the Cu–Se phase is proposed as the origin of CuS platelets. For low Cu/In ratio both binaries are associated to the surface and do not...
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