Metal Halide Perovskite Heterostructures: Blocking Anion Diffusion with Single-Layer Graphene.

ABSTRACT: The development of metal halide perovskite/perovskite heterostructures is hindered by rapid interfacial halide diffusion leading to mixed alloys rather than sharp interfaces. To circumvent this outcome, we developed an ion-blocking layer consisting of single-layer graphene (SLG) deposited between the metal halide perovskite layers and demonstrated that it effectively blocks anion diffusion in a CsPbBr₃/SLG/CsPbI₃ heterostructure. Spatially resolved elemental analysis and spectroscopic measurements demonstrate the halides do not diffuse across the interface, whereas control samples without the SLG show rapid homogenization of the halides and loss of the sharp interface. Ultraviolet photoelectron spectroscopy, DFT calculations, and transient absorbance spectroscopy indi

SUBMITTER: Hautzinger MP 

PROVIDER: S-EPMC9896553 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature