Spin‐Dependent Charge Transport in 1D Chiral Hybrid Lead‐Bromide Perovskite with High Stability

Abstract Spin‐dependent charge transport, along with the potential electronic applications, is investigated in chiral 2D iodide hybrid organic/inorganic perovskites (HOIPs) via the chirality‐induced spin selectivity (CISS) effect, paving a new way in spintronics. Despite the high spin‐polarized current enhancement, the intrinsic oxidation tendency of iodide ions brings about severe problems in the stability and lifetime of electronic devices. Here, spin‐dependent charge transport properties in lead‐bromide perovskites hybrid with chiral R/S ‐methylbenzylammonium (MBA), that is, ( R/S ‐MBA)PbBr 3 are explored. Distinct from layered 2D iodide perovskites ( R/S ‐MBA) 2 PbI 4 which experience obvious crystal degradation along time, ( R/S ‐MBA)PbBr 3 maintain good crystallinity even in the oxidative, humid, and high‐temperature environment due to the lower Fermi level of bromide than iodide. Magnetic conductive atomic force microscopy displays a spin filtration efficiency as high as 90%, showing negligible decay after 1 month. This work expands the spin transport to chiral bromide perovskites with higher stability, and thus provides significant support for the practical application of HOIPs in spintronics.