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

Jan. 17, 2023

We developed and demonstrated a method to place single-layer graphene (SLG) between the metal halide perovskite solution deposited films to block the anion motion across the interface. We show that the SLG does not significantly degrade the performance of the heterostructure.

Scientific Achievement

We showed that SLG can be incorporated between halide perovskite films as an anion diffusion blocking layer, resulting in novel sharp heterostructures not previously accessible.

Significance and Impact

Methods for heterostructure fabrication are critical to expanding the architectures and applications available for semiconductors. These perovskite/perovskite heterostructures were previously inaccessible due to the rapid anion diffusion intrinsic to halide perovskites.

Research Details

• Simple and versatile deposition strategy of SLG on top of halide perovskites was demonstrated.
• Heterostructure characterization via time of flight-secondary ion mass spectrometry, scanning electron microscopy, and basic optical spectroscopy show no anion diffusion and sharp heterojunction interfaces.
• Theory, photoelectron spectroscopy, transient absorbance, and LED fabrication show the graphene does not impede energy transfer processes between the layers.

DOI:  https://doi.org/10.1021/jacs.2c12441