High Magnetic Field Spectroscopy of 2D Hybrid Organic Inorganic Perovskites

We have studied films of two-dimensional (2D) hybrid organic inorganic perovskites (2D-HOIP) using magneto-circular-dichroism (MCD), magneto-electro-absorption (MEA) and field-induced circularly polarized (FICPO) emission at high magnetic fields (up to 25 Tesla) at liquid-He temperature. Particular attention was given to the exciton fine structure in these materials including the exciton substate energy splitting and the Landé g-values. We found evidence for a dark exciton substate at the bottom of the exciton manifold having negative effective g-factor. We also studied the Landau levels related to the continuum bands in these materials from which we determined the energy gap and effective charge currier mass.