Optical and photoemission studies of DLC films prepared with a systematic variation of the sp3:sp2 composition
| Autor: | E. Shefer, Yeshayahu Lifshitz, G. Lempert, E. Grossman, Alon Hoffman, Rachel Chechik, H.-J. Scheibe, D. Bacon, B. Schultrich, Rafi Kalish, Amos Breskin, S. Voellmar |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 1997 |
| Předmět: |
Range (particle radiation)
Materials science Mechanical Engineering Electron energy loss spectroscopy Elektrizität Analytical chemistry chemistry.chemical_element Kohlenstoff-Schichten General Chemistry Magnetismus Wärmetransport Keramik Electronic Optical and Magnetic Materials spektroskopische Oberflächencharakterisierung Ion beam deposition Carbon film chemistry Ellipsometry Attenuation coefficient Materials Chemistry Composition (visual arts) Biokompatibilität Electrical and Electronic Engineering Carbon |
| Zdroj: | Diamond and Related Materials. 6:687-693 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/s0925-9635(96)00696-6 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect