Semiconducting carbon films from a natural source: camphor |
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| Affiliation: | 1. Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 3041 Lemesos, Cyprus;2. Research Unit for Nanostructured Materials Systems, Cyprus University of Technology, 3041 Lemesos, Cyprus;3. Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Av., P.O. Box 20537, 1678 Nicosia, Cyprus;4. Department of Materials Science and Engineering, University of Ioannina, GR-45110 Ioannina, Greece;5. Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro-ku, Tokyo 152-8552, Japan;2. iMott Inc., 3-16-12 Azamino-Minami, Aoba-ku, Yokohama, Kanagawa 225-0012, Japan;3. Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | Thin films of carbon have been grown on alumina substrates by the pyrolysis of camphor at 900 °C for 2 h 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. A Hall-effect study of the as-grown films shows their carrier concentrations to be of the order of 1017 cm?3. The Hall mobilities of these films are found to vary from 1702 to 10263 cm2 V?1 s?1. The thermal bandgaps of these films are found to decrease with increasing of sintering time. Thus, by controlled sintering of camphor-pyrolyzed carbon films, it is possible to obtained a semiconductor with the desired bandgap. Therefore, camphor-pyrolyzed semiconducting carbon films seem to be a promising material with which to develop a photovoltaic solar cell. |
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