Zn(O, S) layers for chalcoyprite solar cells sputtered from a single target A. Grimm, D. Kieven, I. Lauermann, M.Ch. Lux-Steiner, F. Hergert, R. Schwieger and R. Klenk EPJ Photovolt., 3 (2012) 30302 Published online: 17 September 2012 DOI: 10.1051/epjpv/2012011