Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites

March 24, 2020

Title

Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites

Author

Haipeng Lu, Jingying Wang, Chuanxiao Xiao, Xin Pan, Xihan Chen, Roman Brunecky, Joseph J. Berry, Kai Zhu, Matthew C. Beard, Zeev Valy Vardeny

Year

2019

Journal

Science Advances

Abstract

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.

Instrument

J-715

Keywords

Circular dichroism, Stereochemistry, Solid state, Organic chemistry, Materials