National Repository of Grey Literature 7 records found  Search took 0.00 seconds. 
Preliminary balistic electron emission microscopy/spectroscopy characterization of InAs quantum dots in AlGaAs/GaAs heterostructure
Vaniš, Jan ; Henini, M. ; Šroubek, Filip ; Walachová, Jarmila
We presented a characterization of InAs self assembled quantum dots embedded in quantum well of the AlGaAs/GaAs heterostructure using ballistic electron emission microscopy/spectroscopy BEEM/BEES. Structures are grown by MBE. Results of spectroscopic measurements "on the dot" and "out of the dot" are also presented.
Annealing of Bi.sub.2./sub.Te.sub.3./sub. thin films prepared by pulsed laser deposition
Pavelka, Martin ; Zeipl, Radek ; Jelínek, Miroslav ; Walachová, Jarmila ; Studnička, Václav
Bi.sub.2./sub.Te.sub.3./sub. thin films were prepared by laser ablation /PLD/ at room temperature and then annealed in argon atmosphere. Anneling is a widely used method of film properties /primarily crystallinity/ improvement. The influence of annealing on transport properties was studied.
Modification of Bi.sub.2./sub.Te.sub.3./sub. nanolayers
Zeipl, Radek ; Pavelka, Martin ; Jelínek, Miroslav ; Vaniš, Jan ; Šroubek, Filip ; Walachová, Jarmila
Our Bi.sub.2./sub.Te.sub.3./sub. nanolayers were prepared by laser ablation. If we use different depositon condition, prepared layers will have different properties, exactly with rising temperature of substrate during deposition laeyrs becoming smoother. We present STM picture of 60nm thick Bi.sub.2./sub.Te.sub.3./sub. prepared on substrate with temperature during deposition of 400.sup.0.sup.C. We also present modification of layer after many scans were realized by STM on the same place.
Vliv RF výboje na růst nanokrystalických diamantových vrstev deponovaných metodou pulsní laserové depozice
Novotný, Michal ; Jelínek, Miroslav ; Bulíř, Jiří ; Lančok, Ján ; Vorlíček, Vladimír ; Michalka, M. ; Popov, C.
In this paper, we report on the growth of NCD films by PLD in pure hydrogen ambient and by HPLD in Ar/H.sub.2./sub. ambient. HPLD systems were based on combination of PLD and addiational RF discharges. The deposited films were studied using Alfastep profilometer, X-ray diffraction, Raman spectroscopy and scanning electron microscopy
Nanokrystalické diamant/amorfní uhlík kompozitní vrstvy připraveny MWCVD
Popov, C. ; Kulisch, W. ; Boycheva, S. ; Jelínek, Miroslav
The aim of the present work was to prepare nanocomposite films in which both phases are composed of only one element - carbon, i.e. nanosized diamond crystallites embeded in an amorphous carbon matrix. In our study, emphasis was laid on the investigation of both the crystalline(e.g. crystallite size) and the amorphous (e.g. sp.sup.3./sup./sp.sup.2./sup. ratio, H content) fractions of these new nanocomposite films
Nanogranulární vrstvy Co-Al-O připravené laserovou ablací
Chayka, Oleksandr ; Kraus, Luděk ; Fendrych, František ; Kocourek, Tomáš ; Jelínek, Miroslav
The measurements of magnetic and transport properties of the films deposited by laser ablation show that the films prepared on room temperature substrates consist of single-domain nanosized Co particles embeded in an insulating matrix.The films deposited on heated substrates show two orders lower resistance and their MR is one order smaller. This can be explained by the appearance of metallic type conductivity in a network of particles that is presumably due to coalescence of the grains
Optické a transportní transienty v systémech kvantových teček
Král, Karel ; Zdeněk, Petr ; Khás, Zdeněk
Manifestation of special thermodynamic properties of quantum dots in optical measurements are theoretically analyzed

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