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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1540

Title: Semiconducting carbon films from a natural source: camphor
Authors: SHARON, M
SUNDARAKOTEESWARAN, N
KICHAMBARE, PD
KUMAR, M
ANDO, Y
ZHAO, XL
Keywords: tubules
Issue Date: 1999
Publisher: ELSEVIER SCIENCE SA
Citation: DIAMOND AND RELATED MATERIALS,8,485-489
Abstract: Thin films of carbon have been grown on alumina substrates by the pyrolysis of camphor at 900 degrees C for 2h in an argon atmosphere, followed by sintering for various time periods. The effect of sintering time on the surface morphology, conductivity, carrier concentration, mobility and bandgap of camphor-pyrolyzed films is discussed. Structural characterizations are performed on the basis of XRD and SEM analyses. Electrical conductivity measurements of these films, as a function of temperature, suggest them to be semiconductors. Hall-effect study of the as-grown films shows their carrier concentrations to be of the order of 10(17) cm(-3). The Hall mobilities of these films are found to vary from 1702 to 10263 cm(2) V-1 s(-1). The thermal bandgaps of these films are found to decrease with increasing sintering time. Thus, by controlled sintering of camphor-pyrolyzed carbon films, it is possible to obtain a semiconductor with the desired bandgap. Therefore, camphor-pyrolyzed semiconducting carbon films seem to be a promising material to develop a photovoltaic solar cell. (C) 1999 Elsevier Science S.A. All rights reserved.
URI: http://dx.doi.org/10.1016/S0925-9635(98)00289-1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14752
http://hdl.handle.net/100/1540
ISSN: 0925-9635
Appears in Collections:Proceedings papers

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