Pulsed laser deposited tetrahedral amorphous carbon with high sp(3) fractions and low optical bandgaps
Miyajima, Y, Henley, SJ, Adamopoulos, G, Stolojan, V, Garcia-Caurel, E, Drevillon, B, Shannon, JM and Silva, SRP (2009) Pulsed laser deposited tetrahedral amorphous carbon with high sp(3) fractions and low optical bandgaps JOURNAL OF APPLIED PHYSICS, 105 (7). ? - ?. ISSN 0021-8979
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Amorphous carbon films with sp3 bonded carbon fractions over 70% are deposited by pulsed laser deposition. However, the optical bandgap obtained from optical transmittance and spectroscopic ellipsometry analysis shows the values to be below 1.0 eV. A wide range of measurements such as electron energy loss spectroscopy, visible Raman, spectroscopic ellipsometry, optical transmittance, and electrical characterization are performed to elucidate the bonding configurations that dictate microstructural, optical and electrical properties, and their linkage to band structure changes. It is found that stress-induced electronic localized states play an important role in the physical properties of the films deposited. The optical bandgap is shown not to be a good measure of the electrical bandgap, especially for high electric field conduction in these tetrahedral amorphous carbon films.
Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
The following article appeared in Journal of Applied Physics, 105 (7) 073521 and may be found at Y. Miyajima et al., J. Appl. Phys. 105, 073521 (2009)
|Uncontrolled Keywords:||Science & Technology, Physical Sciences, Physics, Applied, Physics, DIAMOND-LIKE CARBON, ELECTRON-ENERGY-LOSS, THIN-FILMS, LOSS SPECTROSCOPY, CONDUCTION MECHANISM, RAMAN-SPECTRA, DENSITY, SILICON, NITRIDE, STRESS|
|Divisions:||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Depositing User:||Melanie Hughes|
|Date Deposited:||20 Nov 2012 10:14|
|Last Modified:||23 Sep 2013 19:49|
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