Electronic properties and structure of carbon nanocomposite films deposited from accelerated C60 ion beam

By methods of scanning tunnelling microscopy and tunnelling spectroscopy the surface structure and electronic properties of carbon films deposited from the mass-separated beam of accelerated C60 ions are studied. The main feature of the surface relief is the presence of quasi-periodic globular struc...

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Veröffentlicht in:Journal of physics. D, Applied physics Applied physics, 2013-12, Vol.46 (48)
Hauptverfasser: Pukha, V E, Karbovskii, V L, Drozdov, A N, Pugachov, A T
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Sprache:eng
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Zusammenfassung:By methods of scanning tunnelling microscopy and tunnelling spectroscopy the surface structure and electronic properties of carbon films deposited from the mass-separated beam of accelerated C60 ions are studied. The main feature of the surface relief is the presence of quasi-periodic globular structures with characteristic sizes of 2-4 nm and a height of about 1 nm. They are lined up in straight rows and curved chains on the entire surface of the film with a typical scale of 3-4 nm. Tunnelling spectra show that the film consists of nanoscale regions with a wide band gap (4-4.6 eV, p-type conductivity) and regions of narrow band gap (1.3-1.8 eV, n-type conductivity). The electronic properties of the surface layers are close to the diamond to a greater extent than the properties of the underlying layers. Transmission electron microscopy allowed attributing the wide band gap regions to amorphous diamond, and the narrow-gap regions to nanocrystals of graphite.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/46/48/485305