Optical and structural properties of ternary nanoaggregates in CsI-PbI2 co-evaporated thin films

Thin films were grown by vacuum co-evaporation of CsI and PbI2 compounds fr om two independent crucibles. X-ray diffraction spectroscopy revealed forma tion of CsPbI3 and Cs4PbI6 nanoaggregates in the thin film samples and gave an estimate of their volume percentage as well. It provided also the grain size estimates, which were compared with direct observation of a thin film surface by atomic force microscopy. The absorption, luminescence and decay kinetics characteristics of thin films grown were measured. The optical ch aracteristics of the mentioned ternary nanoaggregates were determined and c ompared with those of CsPbX3 and Cs4PbX6 (X = Cl, Br) bulk structures.