Spin-Flip Raman Scattering on Electrons and Holes in Two-Dimensional (PEA) PbI Perovskites.

The class of Ruddlesden-Popper type (PEA) PbI perovskites comprises 2D structures whose optical properties are determined by excitons with a large binding energy of about 260 meV. It complements the family of other 2D semiconductor materials by having the band structure typical for lead halide perovskites, that can be considered as inverted compared to conventional III-V and II-VI semiconductors. Accordingly, novel spin phenomena can be expected for them.