Optical and electronic properties of amorphous carbon materials
作者： S Logothetidis
DOI: 10.1016/S0925-9635(03)00015-3
关键词:
摘要: Abstract The optical and electronic properties of amorphous carbon (a-C) films are studied with spectroscopic ellipsometry in the extended energy region from IR to vacuum ultraviolet (VUV). results discussed view structure diamond graphite density states a-C states. It is demonstrated that investigation UV VUV regions can reveal not only their diamond- or graphite-like character, but also local configuration, based on fact strong σ→σ* transitions takes place at high energies. For example, absorption peak sp3 bonded C occurs 9.3 eV, whereas sp2 peaks π σ excitations varies fraction sites. We discuss criteria which calculation bulk dielectric function e(ω) becomes feasible beyond measured range. Based above, effective constant eeff due transitions, number electrons per atom neff, provides valuable information type bonding materials.
harvard.edu
elsevier.com
sci-hub.se 参考文章(21)
Hari Singh Nalwa, Characterization and spectroscopy of thin films Academic Press. ,(2002)
P Lautenschlager, Miquel Garriga, L Vina, Manuel Cardona, None, Temperature dependence of the dielectric function and interband critical points in silicon Physical Review B. ,vol. 36, pp. 4821- 4830 ,(1987) , 10.1103/PHYSREVB.36.4821
S. Logothetidis, M. Gioti, Amorphous carbon films rich in diamond deposited by magnetron sputtering Materials Science and Engineering B-advanced Functional Solid-state Materials. ,vol. 46, pp. 119- 123 ,(1997) , 10.1016/S0921-5107(97)00009-3
M. Hanfland, K. Syassen, R. Sonnenschein, Optical reflectivity of graphite under pressure Physical Review B. ,vol. 40, pp. 1951- 1954 ,(1989) , 10.1103/PHYSREVB.40.1951
G. E. Jellison, F. A. Modine, Parameterization of the optical functions of amorphous materials in the interband region Applied Physics Letters. ,vol. 69, pp. 371- 373 ,(1996) , 10.1063/1.118064
S. Logothetidis, M. Gioti, P. Patsalas, C. Charitidis, Insights on the deposition mechanism of sputtered amorphous carbon films Carbon. ,vol. 37, pp. 765- 769 ,(1999) , 10.1016/S0008-6223(98)00268-1
D. A. G. Bruggeman, Berechnung verschiedener physikalischer Konstanten von heterogenen Substanzen. I. Dielektrizitätskonstanten und Leitfähigkeiten der Mischkörper aus isotropen Substanzen Annalen der Physik. ,vol. 416, pp. 636- 664 ,(1935) , 10.1002/ANDP.19354160705
J Robertson, Diamond-like amorphous carbon Materials Science & Engineering R-reports. ,vol. 37, pp. 129- 281 ,(2002) , 10.1016/S0927-796X(02)00005-0
R. Ahuja, S. Auluck, J. M. Wills, M. Alouani, B. Johansson, O. Eriksson, Optical properties of graphite from first-principles calculations Physical Review B. ,vol. 55, pp. 4999- 5005 ,(1997) , 10.1103/PHYSREVB.55.4999
S. Logothetidis, J. Petalas, H. M. Polatoglou, D. Fuchs, Origin and temperature dependence of the first direct gap of diamond. Physical Review B. ,vol. 46, pp. 4483- 4494 ,(1992) , 10.1103/PHYSREVB.46.4483