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  4. Optical and photoemission studies of DLC films prepared with a systematic variation of the sp3: sp2 composition
 
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1997
Journal Article
Title

Optical and photoemission studies of DLC films prepared with a systematic variation of the sp3: sp2 composition

Abstract
The optical and photoemission properties of hydrogen-free DLC films prepared under conditions which result in different types of carbon bonding (previously determined from electron energy loss spectroscopy) are reported. The films were prepared using a mass selected ion beam deposition system covering the C+ energy range 10 eV - 2 keV, mostly on Si held at room temperature. Previous measurements have shown that the sp3 content of these films varied from 0 to > 80 per cent. The optical constants (n, k absorption coefficient (a)) of theses films were measured by ellipsometry. The energy gaps were derived from Tauc plots (Eg) and from alpha = 10(exp4) cm(exp-1) values (E(0.4)). The enrgy gaps were found to vary with the sp3 content from E < 1 eV (10 per cent sp3) up to E = 2,4 eV (85 per cent sp3). The photoemission absolute quantum efficiencies of these films were independently measured in the UV region using a monochromator system and were compared to those of CVD diamond films and grap hite.
Author(s)
Lifshitz, Y.
Lempert, G.D.
Grossman, E.
Scheibe, H.J.
Völlmar, S.
Schultrich, B.
Breskin, A.
Chechik, R.
Shefer, E.
Bacon, D.
Kalish, R.
Hoffman, A.
Journal
Diamond and Related Materials  
DOI
10.1016/S0925-9635(96)00696-6
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
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