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O: Fachverband Oberflächenphysik

O 90: 2D Materials VI: Growth, Structure and Substrate Interaction

O 90.10: Vortrag

Donnerstag, 21. März 2024, 17:15–17:30, MA 005

Na-doped Borophene/Ir(111) — •Sena Tömekce, Marc G. Cuxart, Knud Seufert, and Willi Auwärter — Physics Department E20, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany

Alkali metal doping has been shown to be an effective strategy to tune the electronic properties of 2D materials, due to their low ionization energy [1,2]. Borophenes, 2D layers of covalently bonded boron atoms, combine many interesting properties such as polymorphism, anisotropy and metallicity, making them promising for various applications [3]. Particularly, when doped by alkali metals, free-standing borophenes have been predicted to be excellent materials for Li/Na ion batteries, offering high charge storage capacity, low diffusion barrier and maintaining metallic conductivity [4,5]. Here, we report on the high-resolution LT-STM (low temperature scanning tunneling microscopy) and XPS (X-ray photoelectron spectroscopy) characterization of Na-doped χ6 borophene/Ir(111). We demonstrate that Na atoms adsorb on borophene without forming clusters, after room temperature deposition. The Na adsorption sites on the borophene lattice were investigated. XPS reveals a binding energy shift of the B 1s core level upon increasing Na coverage, implying charge transfer.

[1] J. Cai et al., Phys. Rev. B. 2018, 98, 195443

[2] D. Marchiani et al., Nano Lett. 2023, 23, 170-176

[3] A. J. Mannix et al., Nat. Nanotechnology. 2018, 13, 444-450

[4] X. Zhang et al., Nanoscale. 2016, 8, 15340-15347

[5] J. Li et al., J. Electrochem. Soc. 2020, 167, 090527

Keywords: borophene; alkali metal doping; Na-ion battery