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

Autor:	Hautzinger MP; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Raulerson EK; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Harvey SP; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Liu T; Department of Chemistry, University of Kentucky, Lexington, Kentucky40506, United States., Duke D; Thomas Lord Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina27708, United States., Qin X; Thomas Lord Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina27708, United States., Scheidt RA; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Wieliczka BM; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Phillips AJ; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Graham KR; Department of Chemistry, University of Kentucky, Lexington, Kentucky40506, United States., Blum V; Thomas Lord Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina27708, United States., Luther JM; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Beard MC; National Renewable Energy Laboratory, Golden, Colorado80401, United States., Blackburn JL; National Renewable Energy Laboratory, Golden, Colorado80401, United States.
Jazyk:	angličtina
Zdroj:	Journal of the American Chemical Society [J Am Chem Soc] 2023 Feb 01; Vol. 145 (4), pp. 2052-2057. Date of Electronic Publication: 2023 Jan 17.
DOI:	10.1021/jacs.2c12441
Abstrakt:	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 CsPbBr 3 /SLG/CsPbI 3 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 CsPbBr 3 /SLG/CsPbI 3 , 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 CsPbBr 3 and CsPbI 3 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.
Databáze:	MEDLINE
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