Thin porous indium tin oxide nanoparticle films: effects of annealing in vacuum and air

Autor:	A. R. van Doorn, Peter Heszler, J. Ederth, Detlef Burgard, Claes-Göran Granqvist, M. J. Jongerius, A. Hultåker, Gunnar A. Niklasson
Rok vydání:	2005
Předmět:	Materials science Absorption spectroscopy Annealing (metallurgy) business.industry Band gap Analytical chemistry General Chemistry Indium tin oxide Ionized impurity scattering Optics Electrical resistivity and conductivity Transmittance General Materials Science Thin film business
Zdroj:	Applied Physics A. 81:1363-1368
ISSN:	1432-0630 0947-8396
DOI:	10.1007/s00339-005-3264-7
Popis:	Electrical and optical properties were investigated in porous thin films consisting of In2O3:Sn (indium tin oxide; ITO) nanoparticles. The temperature-dependent resistivity was successfully described by a fluctuation-induced tunneling model, indicating a sample morphology dominated by clusters of ITO nanoparticles separated by insulating barriers. An effective-medium model, including the effect of ionized impurity scattering, was successfully fitted to measured reflectance and transmittance. Post-deposition treatments were carried out at 773 K for 2 h in both air and vacuum. It is shown that vacuum annealing increases either the barrier width or the area between two conducting clusters in the samples and, furthermore, an extra optical absorption occurs close to the band gap. A subsequent air annealing then reduces the effect of the barriers on the electrical properties and diminishes the absorption close to the band gap.
Databáze:	OpenAIRE
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