Fabrication of ordered structures at the nanoscale limit poses a cornerstone challenge for modern technologies. In this work we show how naturally occurring moiré patterns in Ir(111)-supported graphene template the formation of 2D ordered arrays of substitutional boron species. A complementary experimental and theoretical approach provides a comprehensive description of the boron species distribution, bonding configurations, interfacial interaction with Ir(111) and the impact on graphene's electronic structure. Atomically-resolved scanning tunnelling microscopy images and density functional theory calculations reveal that boron preferably forms small aggregates of substitutional defects in geometrically low regions of the moiré superlattice of graphene, by inducing local bending of graphene towards the underlying Ir(111). Surprisingly, calculations reveal that the incorporation of electron deficient boron does not lead to an enhanced p-type doping, as the local rippling of the graphene layer prompts electron uptake from the iridium substrate that compensates the initial electron loss due to substitutional boron. Scanning tunnelling spectroscopy and angle-resolved photoemission spectroscopy measurements corroborate that the arrays of boron species do not modify the electronic structure of graphene near the Fermi level, hence preserving the slight p-type doping induced by Ir(111).

Cuxart, M., Perilli, D., Tomekce, S., Deyerling, J., Haag, F., Muntwiler, M., et al. (2023). Spatial segregation of substitutional B atoms in graphene patterned by the moiré superlattice on Ir(111). CARBON, 201(5 January 2023), 881-890 [10.1016/j.carbon.2022.09.087].

Spatial segregation of substitutional B atoms in graphene patterned by the moiré superlattice on Ir(111)

Perilli D.;Di Valentin C.
;
2023

Abstract

Fabrication of ordered structures at the nanoscale limit poses a cornerstone challenge for modern technologies. In this work we show how naturally occurring moiré patterns in Ir(111)-supported graphene template the formation of 2D ordered arrays of substitutional boron species. A complementary experimental and theoretical approach provides a comprehensive description of the boron species distribution, bonding configurations, interfacial interaction with Ir(111) and the impact on graphene's electronic structure. Atomically-resolved scanning tunnelling microscopy images and density functional theory calculations reveal that boron preferably forms small aggregates of substitutional defects in geometrically low regions of the moiré superlattice of graphene, by inducing local bending of graphene towards the underlying Ir(111). Surprisingly, calculations reveal that the incorporation of electron deficient boron does not lead to an enhanced p-type doping, as the local rippling of the graphene layer prompts electron uptake from the iridium substrate that compensates the initial electron loss due to substitutional boron. Scanning tunnelling spectroscopy and angle-resolved photoemission spectroscopy measurements corroborate that the arrays of boron species do not modify the electronic structure of graphene near the Fermi level, hence preserving the slight p-type doping induced by Ir(111).
Articolo in rivista - Articolo scientifico
ARPES; Boron doping; CVD; DFT; Graphene; Moiré superlattice; Nano-fabrication; STM; STS; XPS;
English
5-ott-2022
2023
201
5 January 2023
881
890
none
Cuxart, M., Perilli, D., Tomekce, S., Deyerling, J., Haag, F., Muntwiler, M., et al. (2023). Spatial segregation of substitutional B atoms in graphene patterned by the moiré superlattice on Ir(111). CARBON, 201(5 January 2023), 881-890 [10.1016/j.carbon.2022.09.087].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/396141
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