Chirality Transfer and Chirality-Induced Spin Selectivity in Metal Halide Semiconductors

Hybrid organic-inorganic halide perovskites are intriguing chiral material systems owing to their excellent and tunable optoelectronic properties. Typically, chiroptical properties arise due to structural symmetry breaking from chiral A-site organic cation to the inorganic framework. Here, we demonstrate a proximity effect of remote chirality transfer to induce chirality in otherwise <i>achiral</i> 2D halide perovskites. Chirality-induced spin selectivity (CISS) effect is employed to electronically measure the effect of chirality on magnetoresistance (MR) of halide perovskites using spin valves. The spin polarization in chiral perovskites is as high as over 90%, but the efficiency of the spin valves using chiral perovskites is low, with MR values lower than 2%. Addressing the factors contributing to the low performance in spin valves using the CISS effect leads to a significant increase in MR.