Marcus Bär, J.-P. Theisen, Regan G. Wilks, F. Erfurth, Roberto Felix Duarte, Dominic Gerlach, S. Haas, L. Tati-Bismaths, F. Reinert, F. Kronast, T. P. Niesen, J. Palm, S. Visbeck, Lothar Weinhardt
- Spatial variations in the chemical composition of the (Zn,Mg)O/CuIn(S,Se)2 thin-film solar cell interface were studied by photoemission electron microscopy (PEEM). Energy filtered PEEM
images indicate significant differences in the magnesium and zinc distribution. Local photoemission measurements reveal a relative difference in the derived Mg/(ZnþMg) composition of the (Zn,Mg)O material of up to (11.460.7)%, which can be expected to induce band gap
fluctuations of (60630) meV. Furthermore, local areas with significant accumulations of sodium could be observed.