Light-Enhanced Spin Diffusion in Hybrid Perovskite Thin Films and Single Crystals.

Feng Li, Junfeng Ding, Weili Yu, Xinwei Guan, Peng Wang, Di Wu, Tao Wu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Organolead trihalide perovskites have attracted substantial interest with regard to applications in charge-based photovoltaic and optoelectronic devices because of their low processing costs and remarkable light absorption and charge transport properties. Although spin is an intrinsic quantum descriptor of a particle and spintronics has been a central research theme in condensed matter physics, few studies have explored the spin degree of freedom in the emerging hybrid perovskites. Here, we report the characterization of a spin valve that uses hybrid perovskite films as the spin-transporting medium between two ferromagnetic electrodes. Because of the light-responsive nature of the hybrid perovskite, a high magnetoresistance of 97% and a large spin-diffusion length of 81 nm were achieved at 10 K under light illumination in polycrystalline films. Furthermore, by using thin perovskite single crystals, we discovered that the spin-diffusion length was able to reach 1 μm at low temperatures. Our results indicate that the spin relaxation is not significant as previously expected in such lead-containing materials and demonstrate the potential of low-temperature-processed hybrid perovskites as new active materials in spintronic devices.
Original languageEnglish (US)
Pages (from-to)3205-3213
Number of pages9
JournalACS Applied Materials & Interfaces
Volume12
Issue number2
DOIs
StatePublished - Dec 20 2019

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