Spin LEDs Based on a Chiral Halide Perovskite Spin Injector

The chirality induced spin selectivity (CISS) effect is the selective transmission of electron spin dictated by the handedness of chiral molecules (or structures). Materials exhibiting the CISS effect have great potential in acting as spin injectors, yet there are limited demonstrations of incorporating CISS active materials into spintronic devices. Here, we successfully integrate semiconducting chiral halide perovskites with semiconducting LED emitters. Based on the optical selection rules and conservation of angular momentum, we observe circularly polarized light emission as a result of the spin polarized injection from the chiral perovskite into the semiconductor. The large degree of spin polarization is enabled by the semiconductor-semiconductor interface. To further understand what parameters dictate CISS based spin injection efficiency, we have incorporated chiral perovskites with a variety of emitter materials to probe the impact of band offsets, spin lifetimes, and composition. This demonstration opens numerous opportunities to incorporate CISS materials with semiconductors as opto-spintronic technologies and provide some ground rules for achieving high CISS based spin injection efficiency.