Low-Dimensional Chiral Perovskites and Their Heterostructures for Optoelectronic Applications

Low-dimensional chiral perovskites combines the chirality of chiral molecules and the outstanding physical properties of perovskites, which render them promising candidates for high-performance optical, electronic, and spintronic device applications. In particular, carriers in low-dimensional chiral perovskites are highly spin-polarized and thus they can be used as a spin source materials for spontronics and valleytronics. In this talk, I would like to first talk about how we introduce chirality into 2D perovskites and by using chiral 2D perovskite crystals we have demonstrated circularly polarized light emission and detected all polarization states based on chiral 2D perovskite photodetectors. Then, I will also introduce by stacking chiral two-dimensional perovskites and monolayer transition metal chalcogenides to form heterostructures to achieve efficient spin injection without an external magnetic field, thereby achieving valley freedom control. This valley polarization manipulation by using chiral 2D perovskites can also achieve in the interlayer excitons formed between chiral 2D perovskite and different types of monolayer transition metal chalcogenides. In addition, this strategy has been extended to zero-dimensional chiral bismuth-based perovskites, which shows high a high degree of circularly polarized photoluminescence and high spin injection efficiency within perovskite/WSe₂ heterostructure. Finally, I will talk about on-chip filterless full-Stokes polarimeter by using the optical anisotropy between the out-of-plane and in-plane direction of chiral 2D perovskites together with their chirality.