Thesis defense of Johan Erik Kirstein

In the present work, the charge carrier spin dynamics in lead halide perovskites APbX3, with X = {I,Br,Cl} are studied. The lead halide perovskites are distinguished with respect to the groups of purely inorganic perovskites with A = Cs and hybrid organic inorganic ones with A = {MA,FA} (methylammonium and formamidinium), as well as their size, i.e. macroscopic single crystals or nano crystals. The spin dynamics of the charge carriers, electrons and holes, are mainly investigated using picosecond resolution Kerr and Faraday spectroscopy. In addition, the observation of the spin dynamics is complemented by exciton spectroscopy (polarization-resolved photoluminescence, reflection, and transmission) and time-resolved differential reflectometry. Nanosecond spin dynamics are observed and the underlying interaction mechanisms are revealed by the experimental techniques, with a focus on interaction of charge carrier and nuclear spins.

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