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

Matthew Hautzinger, Emily Raulerson, Steven Harvey, Tuo Liu, Daniel Duke, Xixi Qin, Rebecca Scheidt, Brian Wieliczka, Alan Phillips, Kenneth Graham, Volker Blum, Joseph Luther, Matthew Beard, Jeffrey Blackburn

Research output: Contribution to journalArticlepeer-review

12 Scopus Citations

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 indicate the SLG has little electronic impact on the individual semiconductors. In the CsPbBr3/SLG/CsPbI3, we find a type I band alignment that supports transfer of photogenerated carriers across the heterointerface. Light-emitting diodes (LEDs) show electroluminescence from both the CsPbBr3 and CsPbI3 layers with no evidence of ion diffusion during operation. Our approach provides opportunities to design novel all-perovskite heterostructures to facilitate the control of charge and light in optoelectronic applications.

Original languageAmerican English
Pages (from-to)2052-2057
Number of pages6
JournalJournal of the American Chemical Society
Volume145
Issue number4
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-84657

Keywords

  • graphene
  • heterostructure
  • perovskite

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