Rashba Splitting in Hybrid Lead Halide Perovskites probed by Photogalvanic Spectroscopy

Hybrid Lead Halide Perovskites (HLHPs) such as MAPbX₃ (where MA is methyl-ammonium and X is halogen) have shown unprecedented performance in optoelectronic device applications such as solar cells, photodetectors and light emitting diodes. The recent discoveries of giant Rashba splitting in both bulk (3D) and two-dimensional (2D) HLHPs have raised promise that these compounds may be excellent candidates for spintronic device applications. Using both photogalvanic (PGA) and photoluminescence spectroscopies we evaluate the Rashba splitting value in both polycrystalline and single crystal HLHPs. We have uncovered the morphological influence on the Rashba splitting in these compounds by measuring angular, temperature and excitation dependencies of the PGA. We also report on the influence of defects and grain boundaries on the Rashba splitting in various HLHP crystallographic phases.