Jump to main content
Jump to site search

Issue 23, 2020
Previous Article Next Article

Tailoring the preferable orientation relationship and shape of α-FeSi2 nanocrystals on Si(001): the impact of gold and the Si/Fe flux ratio, and the origin of α/Si boundaries

Author affiliations

Abstract

The growth of α-FeSi2 nanocrystal ensembles on gold-activated and gold-free Si(001) surfaces at different Si/Fe flux ratios via molecular beam epitaxy is reported. The study reveals that the utilisation of gold as a catalyst regulates the preferable orientation relationship (OR) of the nanocrystals to silicon and their morphology at a given Si/Fe flux ratio. α-FeSi2 free-standing crystals with continuously tuned sizes from 30 nm up to several micrometres can be grown with an α(001)//Si(001) basic OR under gold-assisted conditions and an α(111)//Si(001) OR under gold-free growth conditions on a Si(001) surface. The preferred morphology of nanocrystals with a particular OR can be altered through changes to the Si/Fe flux ratio. Herein, the microstructure and basic OR between the silicide nanocrystals and the silicon substrate, and the formation of nanocrystal facets were analysed in detail with the help of microscopic techniques and simulation methods based on the analysis of near coincidence site (NCS) distributions at silicide/silicon interfaces. On the basis of the simulations used, we managed to reveal the nature of the interfaces observed for the main types of α-FeSi2 nanocrystals grown. Three types of interfaces typical for nanoplates with an α(001)//Si(001) basic OR, which are (i) stepped, (ii) stressed, and (iii) flat, are explained based on the tendency for the NCS density to increase at the interface. The results presented reveal the potential for the bottom-up fabrication of α-FeSi2 nanocrystals with tuned physical properties as potentially important contact materials and as building blocks for future nanoelectronic devices.

Graphical abstract: Tailoring the preferable orientation relationship and shape of α-FeSi2 nanocrystals on Si(001): the impact of gold and the Si/Fe flux ratio, and the origin of α/Si boundaries

Back to tab navigation

Supplementary files

Article information


Submitted
15 Mar 2020
Accepted
08 May 2020
First published
11 May 2020

CrystEngComm, 2020,22, 3943-3955
Article type
Paper

Tailoring the preferable orientation relationship and shape of α-FeSi2 nanocrystals on Si(001): the impact of gold and the Si/Fe flux ratio, and the origin of α/Si boundaries

I. A. Tarasov, T. E. Smolyarova, I. V. Nemtsev, I. A. Yakovlev, M. N. Volochaev, L. A. Solovyov, S. N. Varnakov and S. G. Ovchinnikov, CrystEngComm, 2020, 22, 3943
DOI: 10.1039/D0CE00399A

Social activity

Search articles by author

Spotlight

Advertisements