Rashba splitting effect in doped 2D organic-inorganic hybrid perovskite multiple quantum wells

Two-dimensional (2D) organic–inorganic hybrid perovskite multiple quantum wells which consist of multilayers of alternate organic and inorganic layers exhibit large exciton binding energies due to the dielectric confinement between the inorganic and organic layers. These naturally formed multiple quantum wells have strong spin-orbit coupling (SOC) due to the presence of heavy elements in their crystal structures. The strong SOC may split the spin-degenerate bands in these noncentrosymmetric compounds, thus leading to the Rashba splitting effect. Moreover, the Rashba splitting effect may be enhanced in 2D organic–inorganic hybrid perovskite multiple quantum wells by the introduction of dopants. Here, we have used ultrafast transient, nonlinear optical spectroscopies to study how doping affect exciton and free-carriers in 2D perovskite thin films. Our findings suggest that doped organic-inorganic hybrid perovskites have great potential for sensing and spintronics applications.