Spin-Dependent Charge Transport through 2D Chiral Hybrid Perovskite Layers
Dec. 6, 2019
Here we demonstrate how to integrate an oriented chiral organic sublattice into an inorganic framework, creating a semiconducting chiral system that can transport electrons with the desired spin control.
We developed oriented 2D layered Pb-Iodide perovskite films with chiral organic molecules. The films achieve ~90% spin-polarized transport. Such that for "right"-handed molecules electrons with 'up'-spins transmit and 'down' –spins are blocked.
Significance and Impact
Controlling and manipulating spin-populations represents a different way to build electronic-devices. Chiral-induced spin selectivity (CISS) has been observed in monolayers of chiral organic molecules. Our approach allows for self-assembled stacks of chiral organic molecules to be the spin-filters. Much larger polarization factors can be achieved as well as larger form factors.
- Prepare 2D Pb-I perovskite thin films based on R, and S- methylammonium benzene (R,S-MBA)
- Spin filter effect was measured using conductivity force magnetic AFM (atomic force microscopy). Spin-valves with just one ferromagnet were fabricated.