Nano Archive

Electrical transport and morphological study of PLD-grown nanostructured amorphous carbon thin films

Kant, K. Mohan and Reddy, N. Mahipal and Rama, N and Sethupathi, K and Rao, M. S. Ramachandra (2006) Electrical transport and morphological study of PLD-grown nanostructured amorphous carbon thin films. Nanotechnology, 17 (20). pp. 5244-5247. ISSN 09574484

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Official URL: http://iopscience.iop.org/0957-4484/17/20/033/?ejr...

Abstract

Nanostructured carbon thin films have been actively investigated recently for their electroresistance (ER) properties. Furthermore, carbon films with nonlinear current–voltage (I–V) characteristics have potential application in field-emission devices. This has motivated us to study the effect of various growth parameters on the physical and morphological properties of carbon films grown by pulsed laser deposition (PLD). Carbon films have been deposited using a graphite target at different partial pressures of argon. The morphology of film surfaces deposited at various growth conditions was monitored using an atomic force microscope (AFM). AFM studies showed nanostructured grain growth with average grain size of about 80–90 nm. As the deposition time was decreased down to 1 min, the grain size was also found to decrease correspondingly. From Raman spectroscopic measurements an increase in the I(D)/I(G) ratio and a decrease in FWHM (G) clearly revealed the promotion of sp2 hybridization as the substrate temperature increased. All the films show semiconducting behaviour with the dominant conduction process being the three-dimensional (3D) variable range hopping (VRH) mechanism. Nonlinear I–V curves were obtained for carbon films deposited on p-type Si indicating diode-like behaviour. The most significant result of this study was the observation of a large electroresistance value.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5625
Deposited By:JNCASR
Deposited On:11 Aug 2009 07:20
Last Modified:11 Aug 2009 07:20

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