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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/6558

Title: Electrical and optical properties of semiconducting camphoric carbon films
Authors: SHARON, M
PRADHAN, D
ANDO, Y
ZHAO, XL
Keywords: amorphous diamond
temperature
deposition
bonds
cell
Issue Date: 2002
Publisher: ELSEVIER SCIENCE BV
Citation: CURRENT APPLIED PHYSICS, 2(6), 445-450
Abstract: In situ variation in resistance of camphoric carbon versus time of pyrolysis, temperature of pyrolysis and effect of sintering are studied to perceive the time required for the completion of pyrolysis and the activation energy from the electrical conductance plot. Variation in the electrical conductance versus temperature and activation energies derived from these measurements, are reproducible when film is thermally treated below 750 degreesC. Thermal treatment above 750 degreesC changes the anatomy of the film causing a change in the conductance profile as well as decreases its band gap to 0.1 eV. Camphor pyrolyzed at 650 degreesC gives semiconducting carbon with optical band gaps 1 eV (direct) and 0.8 eV (indirect). Increase in pyrolysis temperature also shifts G-band of Raman spectrum from 1605 to 1586 cm(-1) i.e., towards value corresponding to graphitic carbon. SEM micrograph of camphoric film shows absence of any carbon nanobeads or fibers as normally observed with camphoric carbon pyrolysed in this temperature range. (C) 2002 .
URI: http://dx.doi.org/10.1016/S1567-1739(02)00154-2
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6558
http://hdl.handle.net/10054/6558
ISSN: 1567-1739
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