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Národní úložiště šedé literatury Nalezeno 6 záznamů.  Hledání trvalo 0.00 vteřin. 
Diamond thin film development and SIMS analysis on various substrates
 Vincze, A. ; Michniak, P. ; Haško, D. ; Michalka, M. ; Varga, Marián ; Dobročka, E.
The contribution shows the possibilities of the diamond growth on various substrates. The thin film samples were prepared using hot filament CVD. The analysis of the diamond coatings were done by various methods. SEM, XRD, Raman spectrometry and SIMS were done in order to characterize the samples. The results of the diamond thin films are discussed.
Úplný záznam
Influence of nucleation and methane concentration on buckypapers exposed to hot filament chemical vapor deposition process
 Varga, Marián ; Kotlár, M. ; Vretenár, V. ; Ižák, Tibor ; Šoltýs, J. ; Kromka, Alexander ; Veselý, M.
In this article we investigate the nanocomposite material formation, particularly the deposition of nanocrystalline diamond film on buckypaper (BP) substrate. The buckypapers were prepared from single-wall carbon nanotubes (SWCNT) mixture produced by laser ablation method. We have investigated the influence of the nucleation and methane concentration on buckypapers exposed to the hot filament chemical vapor deposition process.
Úplný záznam
Influence of methane concentration on diamond film morphology and growth rate
 Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Potměšil, Jiří ; Hruška, Karel
In this study we investigated the influence of methane concentration on the diamond film growth. The experiments were carried out in focused microwave chemical vapour deposition system. The methane concentration was varied from 0.5% to 10 % of CH4 in H2 atmosphere. The final film morphology, chemical composition and growth rate were investigated by scanning electron microscopy (SEM), Raman spectroscopy and optical reflectance measurement. We observed, that increasing of CH4 concentration enhances the growth rate, but at the expense of the diamond film quality.
Úplný záznam
Influence of CO.sub.2./sub. concentration on diamond film morphology in pulsed linear antenna microwave plasma CVD system
 Domonkos, M. ; Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Hruška, Karel
The diamond films were deposited in a pulsed linear antenna microwave plasma system. The influence of CO2 addition into the standard CH4/H2 gas mixture on the diamond film morphology was investigated. The concentration of CO2 varied from 0% up to 80% in CO2/CH4/H2 gas mixture. The film morphology, the growth rate and the ratio of sp3/sp2 carbon bonds were investigated. It was found that increasing of CO2 concentration resulted in enhanced growth rate (from 20 up to 36 nm/h). However, at very high CO2 concentrations (>40%) dominates etching instead of growth process. Moreover, we found that increasing of CO2 enhances the diamond film quality.
Úplný záznam
Photothermal and photocurrent spectroscopy of wide band gap nanocrystalline semiconductors
 Remeš, Zdeněk ; Babchenko, Oleg ; Neykova, Neda ; Varga, Marián
Optical spectroscopy belongs to the most important methods applied to characterize thin films. Photothermal deflection spectroscopy (PDS) as well as the dual beam photocurrent (DBP) spectroscopy in near ultraviolet (200-400 nm), visible (400-700 nm) and near infrared regions (700-2000 nm) are particularly useful for study of the wide band gap semiconductors deposited as thin layers on glass substrates. In our laboratory we focus on optically transparent thin films such as nanocrystalline diamond (NCD) or ZnO nanostructures with size too small to be visualized in optical microscope and the optical absorption edge in the ultraviolet region. In this contribution we summarize how to evaluate the optical absorption edge and the defects in the band gap of these wide band gap nanocrystalline semiconductors.
Úplný záznam
Optické charakterizační metody ve výzkumu solárních článků
 Remeš, Zdeněk ; Vaněček, Milan ; Poruba, A.
Optická spektroskopie patří k nejdůležitějším technikám používaným k charakterizaci tenkých vrstev a solárních článků. Na našem pracovišti se zabýváme především následujícími metodami: Fotoproudová spektroskopie (CPM), Fourier Transform Photocurrent Spectroscopy (FTPS), Fototermální spektroskopie (PDS), infračervená spektroskopie (FTIR) and optical spektroscopie with mikrometric resolution.
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