Circularly polarized photoluminescence and Hanle effect measurements of spin relaxation in organic–inorganic hybrid perovskite films

Partial circularly polarized photoluminescence with polarization degree of 2% from CH₃NH₃PbBr₃ film at 77 K is observed, excited using a circularly polarized 532 nm laser. Moreover, the Hanle effect is measured to study spin relaxation in CH₃NH₃PbBr₃ film, yielding a spin lifetime of ∼240 ps at 77 K.