We investigate various energy materials by means of several analysis methods, if possible, on identical specimen areas, in order to improve the information depth of the results, but also to correlate microstructural, compositional, and optoelectronic material properties with one another. Thus, it is possible to determine microstructure-property relationships, e.g., of grain boundaries or dislocations. In battery materials, we are able to analyze the lateral lithium distributions in secondary phases by means of EDXS.
In collaboration with the group of Prof. C.T. at HU Berlin, the phase segregation process in mixed-halide (Cl, Br, I) perovskite nanocrystals is monitored in-situ by means of (S)TEM imaging. Moreover, we are able to observe a corresponding phase segregation process also in mixed-halide thin films within individual grains via time series of CL images combined with SEM imaging.
