Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites
Haipeng Lu, Jingying Wang, Chuanxiao Xiao, Xin Pan, Xihan Chen, Roman Brunecky, Joseph J. Berry, Kai Zhu, Matthew C. Beard, Zeev Valy Vardeny
Chiral-induced spin selectivity (CISS) occurs when the chirality of the transporting medium selects one of the two spin ½ states to transport through the media while blocking the other. Monolayers of chiral organic molecules demonstrate CISS but are limited in their efficiency and utility by the requirement of a monolayer to preserve the spin selectivity. We demonstrate CISS in a system that integrates an inorganic framework with a chiral organic sublattice inducing chirality to the hybrid system. Using magnetic conductive-probe atomic force microscopy, we find that oriented chiral 2D-layered Pb-iodide organic/inorganic hybrid perovskite systems exhibit CISS. Electron transport through the perovskite films depends on the magnetization of the probe tip and the handedness of the chiral molecule. The films achieve a highest spin-polarization transport of up to 86%. Magnetoresistance studies in modified spin-valve devices having only one ferromagnet electrode confirm the occurrence of spin-dependent charge transport through the organic/inorganic layers.
Circular dichroism, Stereochemistry, Solid state, Organic chemistry, Materials