Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites
Spin-dependent charge transport through 2D chiral hybrid lead-iodide perovskites
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DOI：
10.1126/sciadv.aay0571
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发表时间：
2019-12-01
期刊：
影响因子：
13.6
通讯作者：
Vardeny, Zeev Valy
中科院分区：
文献类型：
--
作者：
Lu, Haipeng;Wang, Jingying;Vardeny, Zeev Valy
当传输介质的手性选择两个自旋1/2态中的一个通过介质传输，同时阻挡另一个时，发生手性诱导自旋选择性（CISS）。手性有机分子的单层显示出CISS，但是由于需要单层来保持自旋选择性，因此它们的效率和实用性受到限制。我们证明了在一个系统中的CISS，整合了一个无机框架与一个手性有机亚晶格诱导手性的杂化系统。利用磁探针原子力显微镜（AFM）研究了手性Pb-碘化物有机/无机杂化钙钛矿体系的CISS行为.通过钙钛矿薄膜的电子输运取决于探针尖端的磁化强度和手性分子的旋向性。该薄膜实现了高达86%的最高自旋极化输运。在仅具有一个铁磁电极的改进的自旋阀器件中的磁阻研究证实了通过有机/无机层的自旋相关电荷输运的发生。
Chiral-induced spin selectivity (CISS) occurs when the chirality of the transporting medium selects one of the two spin 1/2 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.