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Spectroscopic ellipsometry and Raman study of fluorinated nanocrystalline carbon thin films

Title
Spectroscopic ellipsometry and Raman study of fluorinated nanocrystalline carbon thin films
Authors
Lee H.Kim I.-Y.Han S.-S.Bae B.-S.Choi M.K.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2001
Journal Title
Journal of Applied Physics
ISSN
0021-8979JCR Link
Citation
vol. 90, no. 2, pp. 813 - 818
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Using spectroscopic ellipsometry and Raman spectroscopy, we measured the pseudodielectric function and the phonon frequencies of fluorinated nanocrystalline carbon (nc-C:F) thin films grown on silicon substrate at varying growth temperature and gas flux ratio of CH 4 and CF 4. Utilizing the Tauc-Lorentzian formula, we performed multilayer analysis to estimate the dielectric function of the fluorinated nanocrystalline carbon thin films. We also adopted Gaussian-like density-of-states model proposed by Demichelis et al. [Phys. Rev. B 45, 14364 (1992)] and estimated the amplitude A, the transition energy E π, and the broadening σ π of π→π* transitions. Based on this model, we explained the change of the optical gap and the refractive index in terms of the change of the amplitude A rather than the shift of transition energy Eπ of π→π* transitions. Raman and ellipsometric study suggested that the average size of nanocrystallites in the fluorinated carbon thin films was smaller than that of amorphous hydrogenated carbon films studied by Hong et al. [Thin Solid Films 352, 41 (1999)]. © 2001 American Institute of Physics.
DOI
10.1063/1.1378337
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자연과학대학 > 물리학전공 > Journal papers
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