Nanoscale synthesis of ionic analogues of bilayer silicene with high carrier mobility

Author(s)
Dmitry V. Averyanov, Peitao Liu, Ivan S. Sokolov, Oleg E. Parfenov, Igor A. Karateev, Domenico Di Sante, Cesare Franchini, Andrey M. Tokmachev, Vyacheslav G. Storchak
Abstract

Design of materials with special properties benefits from establishing deep structural and electronic analogies between emerging and existing materials. The Zintl anion [Al2Si2](2-) is both isostructural and isoelectronic to bilayer silicene; it thus makes a promising building block to assemble electronic materials. Here, we show that nanoscale films of SrAl2Si2, a semimetal formed by alternating [Al2Si2] and Sr layers, exhibit a high carrier mobility, exceeding 10 000 cm(2) V-1 s(-1). The dominant role of the anionic bilayers in the electronic structure and transport properties is established by band structure calculations. To synthesize monocrystalline epitaxial films of SrAl2Si2 with atomically sharp interfaces, a general two-step route involving a sacrificial 2D template is devised. A distinct advantage of the films is their natural integration with silicon technology. The results establish a platform for engineering layered ionic nanomaterials.

Organisation(s)
Computational Materials Physics
External organisation(s)
Russian Research Centre Kurchatov Institute, Julius-Maximilians-Universität Würzburg, Università degli Studi di Bologna
Journal
Journal of Materials Chemistry C
Volume
9
Pages
8545-8551
No. of pages
7
ISSN
2050-7526
DOI
https://doi.org/10.1039/d1tc01951a
Publication date
05-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/nanoscale-synthesis-of-ionic-analogues-of-bilayer-silicene-with-high-carrier-mobility(27df69c2-d9ff-4f5c-acd3-5a8d1d25fbe1).html