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2D Antimony–Arsenic Alloys
Author(s) -
FortinDeschênes Matthieu,
Waller Olga,
An Qi,
Lagos Maureen J.,
Botton Gianluigi A.,
Guo Hong,
Moutanabbir Oussama
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201906540
Subject(s) - antimony , arsenic , raman spectroscopy , x ray photoelectron spectroscopy , materials science , alloy , arsenide , graphene , arsine , heterojunction , molecular beam epitaxy , semiconductor , epitaxy , chemical engineering , nanotechnology , metallurgy , chemistry , gallium arsenide , optoelectronics , catalysis , biochemistry , physics , layer (electronics) , phosphine , optics , engineering
Abstract Alloying in group V 2D materials and heterostructures is an effective degree of freedom to tailor and enhance their physical properties. Up to date, black arsenic‐phosphorus is the only 2D group V alloy that has been experimentally achieved by exfoliation, leaving all other possible alloys in the realm of theoretical predictions. Herein, the existence of an additional alloy consisting of 2D antimony arsenide (2D‐As x Sb 1− x ) grown by molecular beam epitaxy on group IV semiconductor substrates and graphene is demonstrated. The atomic mixing of As and Sb in the lattice of the grown 2D layers is confirmed by low‐energy electron diffraction, Raman spectroscopy, and X‐ray photoelectron spectroscopy. The As content in 2D‐As x Sb 1− x is shown to depend linearly on the As 4 /Sb 4 deposition rate ratio and As concentrations up to 15 at% are reached. The grown 2D alloys are found to be stable in ambient conditions in a timescale of weeks but to oxidize after longer exposure to air. This study lays the groundwork for a better control of the growth and alloying of group V 2D materials, which is critical to study their basic physical properties and integrate them in novel applications.