Photoelectron spectromicroscopy at chalcopyrite films

► Application of spectroscopic PEEM and synchrotron radiation. ► Thin film solar cell absorber materials prepared in UHV by MBE as a model system. ► Detection of Cu2Se nanocrystal precepitations on an epitaxial CuInSe2 (1 1 2) surface. ► Observation of lateral inhomogenties in solarcell model interfaces prepared by MBE.