TY - GEN A1 - Wilks, Regan G. A1 - Repins, Ingrid A1 - Contreras, M. A. A1 - Duarte, Roberto Felix A1 - Herrero-Albillos, J. A1 - Tati-Bismaths, L. A1 - Kronast, F. A1 - Noufi, R. A1 - Bär, Marcus T1 - Intergrain variations of the chemical and electronic surface structure of polycrystalline Cu(In,Ga)Se2 thin-film solar cell absorbers T2 - Applied Physics Letters N2 - The μm-scale spatial distribution of the elements of polycrystalline Cu(In1− x Ga x )Se2 absorber surfaces is examined using x-ray photoelectron emission microscopy. The chemical composition varies from grain to grain, and a direct, linear anticorrelation between the In 3d and Ga 2p photoemission line intensities is observed. The line intensities are interpreted in terms of a varying value of x= Ga/(In+ Ga); the band gaps calculated from the inferred compositions of the grains are shown to be normally distributed with a standard deviation of 40 meV. Y1 - 2012 SN - 0003-6951 VL - 101 IS - 10 SP - 103908-1 EP - 103908-4 ER - TY - GEN A1 - Bär, Marcus A1 - Theisen, J.-P. A1 - Wilks, Regan G. A1 - Erfurth, F. A1 - Duarte, Roberto Felix A1 - Gerlach, Dominic A1 - Haas, S. A1 - Tati-Bismaths, L. A1 - Reinert, F. A1 - Kronast, F. A1 - Niesen, T. P. A1 - Palm, J. A1 - Visbeck, S. A1 - Weinhardt, Lothar T1 - Lateral inhomogeneity of the Mg/(Zn+Mg) composition at the (Zn,Mg)O/CuIn(S,Se)2 thin-film solar cell interface revealed by photoemission electron microscopy T2 - Journal of Applied Physics N2 - 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. Y1 - 2013 U6 - https://doi.org/10.1063/1.4804413 SN - 1520-8850 VL - 113 IS - 19 SP - 193709 ER -