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Electrical properties of nanostructured tin oxide surfaces produced by thermal treatments

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Maestre Varea, David and Cremades Rodríguez, Ana Isabel and Gregorati, Luca and Heiderhoff, R. and Balk, L.J. and Piqueras de Noriega, Javier (2009) Electrical properties of nanostructured tin oxide surfaces produced by thermal treatments. Journal of Nanoscience and Nano techology, 9 (3). pp. 1772-1777. ISSN 1533-4880

Official URL: http://dx.doi.org/10.1166/jnn.2009.385


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Abstract

Sintering SnO(2) powder in air or under an oxygen atmosphere at different temperatures, leads to polycrystalline samples with nanostructured surface as revealed by atomic force microscopy (AFM). The thermal treatments are also responsible for the variation of the surface electrical properties, as studied by scanning spreading resistance microscopy (SSRM) and scanning tunnelling microscopy and spectroscopy (STM-STS). The surface presents a p-conductance, contrary to the n-type characteristic of the bulk, and a band gap lower than the bulk band gap (3.6 eV). The electrical behaviour at the grain boundaries and the role of oxygen are discussed. X-ray photoelectron spectroscopy (XPS) results show a higher presence of oxygen at the boundaries, which generates a shift of the Fermi level position (E(F)-E(V)) towards lower energies.


Item Type:Article
Uncontrolled Keywords:Scanning Tunneling Spectroscopy, Potential Barrier Formation, Grain-Boundaries, Oxygen, Films, SnO_2, Microscope, Cathodoluminescence, Luminescence, Defects
Subjects:Sciences > Physics > Materials
ID Code:23032
Deposited On:07 Oct 2013 16:34
Last Modified:07 Oct 2013 16:34

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