Abstract：
:Cd3As2 has long been known as a high-mobility semiconductor. The recent finding of a topological semimetal state in this compound has demanded growth of epitaxial films with high crystallinity and controlled thickness. Here we report the structural characterisation of Cd3As2 films grown on SrTiO3 substrates by solid-phase epitaxy at high temperatures up to 600 °C by employing optimised capping layers and substrates. The As triangular lattice is epitaxially stacked on the Ti square lattice of the (001) SrTiO3 substrate, producing (112)-oriented Cd3As2 films exhibiting high crystallinity with a rocking-curve width of 0.02° and a high electron mobility exceeding 30,000 cm2/Vs. The systematic characterisation of films annealed at various temperatures allowed us to identify two-step crystallisation processes in which out-of-plane and subsequently in-plane directions occur with increasing annealing temperature. Our findings on the high-temperature crystallisation process of Cd3As2 enable a unique approach for fabricating high-quality Cd3As2 films and elucidating quantum transport by back gating through the SrTiO3 substrate.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Nakazawa Y,Uchida M,Nishihaya S,Kriener M,Kozuka Y,Taguchi Y,Kawasaki Mdoi
10.1038/s41598-018-20758-7subject
Has Abstractpub_date
2018-02-02 00:00:00pages
2244issue
1issn
2045-2322pii
10.1038/s41598-018-20758-7journal_volume
8pub_type
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