Previous work has shown that whilenCdTe‐electrolyte solar cells are low cost and efficient, their photocurrent decays after a few hours of operation. We ave systematically analyzed the changes that take place at the interface. Auger spectroscopy measurements have shown out‐diffusion of Cd2+and the formation of a Te layer at the surface. Electroreflectance (ER) and electroluminescence measurements have further shown that this process results in the formation of ap‐type region. The evolution of the ER spectra as thep‐type region develops was followed and fully analyzed. This technique offers the advantage of easy control and optimization of thep‐njunction growth parameter. The influence of the Te layer on the cell performance was determined from spectral response measurements.
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