Nanostructured surfaces
Nanostructures of s- and d-metals on van der Waals surfaces of InSe and GaSe semiconductor single crystals
Karbivskyy V.L.1, Kovalyuk Z.D.2, Smolyak S.S.1,
Romansky A.A.1, Karbivska L.I.1

1Department of Nanostructures Physics, G.V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine.
Academician Vernadsky Boulevard, 36, Kyiv- 03142, Ukraine. 
E-mail: karb@imp.kiev.ua
2Chernivtsi department, Institute for Problems of Materials Science, N.A.S. of Ukraine.

The formation mechanisms of Cu, Ag, and Au nanoreliefs on the surface of InSe and GaSe single crystals during multistage thermal deposition have been investigated.
Vacuum thermal deposition of Cu and Au (without sample cooling and the presence of inert gases) on the surface of an InSe (0001) single crystal at the same deposition conditions demonstrates different deposition mechanisms from the atomic metal gas phase.
On van der Waals surfaces, copper forms clusters with a monomodal distribution (Fig. 1), while gold forms monolayers of a flaky structure. A small influence of the interface surface on the geometry and symmetry of the created nanostructures of copper and gold is established. The processes of formation of copper and gold nanostructures under these conditions are badly described by the known growth mechanisms.

Fig. 1. Tunnel microscopic images of copper surface on InSe (0001) (JSPM-4610 tunnel microscope).

It is shown that the density of electronic states curves obtained experimentally by the method of tunneling spectroscopy and calculated within the density functional theory method are in good agreement.