National Repository of Grey Literature 26 records found  beginprevious17 - 26  jump to record: Search took 0.01 seconds. 
Detektory rtg a částicového záření na bázi indium fosfidu
Pekárek, Ladislav ; Žďánský, Karel
Indium phospide single crystals were grown by Czochralski method. Various dopants were added to the melt to obtain semi-insulating crystals suitable for detection purposes. Prototype detectors were prepared and evaluated by spectral detection of alpha particles and x-rays.
Růst InP metodou LPE s přídavkem prvků vzácných zemin do taveniny
Grym, Jan ; Procházková, Olga ; Zavadil, Jiří ; Žďánský, Karel
Addition of REs to the growth melt is known to have purifying effect on AIIIBV LPE layers. Each member of REs family acts in its own way. Small addition of Tb, Dy, Tm, and Pr leads to pronounced gettering of shallow donors, the high purity n-type InP can be grown. Exceeding certain concentration, reversal of conductivity type from n to p occurs. Addition of Tm during growth on InP:Fe substrates always results in the preparation of semi-insulating layers due to Fe out-diffusion mediated by RE admixture.
Thickness dependence of transport properties of Bi.sub.2./sub.Te.sub.3./sub. layers
Zeipl, Radek ; Lošťák, P. ; Pavelka, Martin ; Žďánský, Karel ; Jelínek, Miroslav ; Walachová, Jarmila
The transport properties of layers, prepared by laser ablation, as Hall mobility and conductivity on their thickness at room temperature are presented. This thermoelectric materials is potential candidate for many applications as for thermoelectric devices for power generation, cooling and sensors.
Thickness dependence of transport properties of Bi.sub.2./sub.Te.sub.3./sub. layers
Zeipl, Radek ; Lošťák, P. ; Pavelka, Martin ; Žďánský, Karel ; Jelínek, Miroslav ; Walachová, Jarmila
The transport properties of layers, prepared by laser ablation, as Hall mobility and conductivity on their thickness at room temperature are presented. This thermoelectric materials is potential candidate for many applications as for thermoelectric devices for power generation, cooling and sensors.
Characterisation of InP layers prepared by the LPE method with Pr and Nd addition in the growth melt
Grym, Jan ; Procházková, Olga ; Zavadil, Jiří ; Žďánský, Karel
High purity InP epitaxial layers were grown by LPE from the melt conataining, besides essential components, also rare-earth elements admixture. The layers were examined by SEM, low temperature PL spectroscopy, C-V measurements and temperature dependent Hall effect. The behaviour and the impact of Pr and Nd were compared. The concentration of shallow impurities was reduced by up to three orders of magnitude. PL spectra were markedly narrowed and fine spectral features were resolved.
Příprava a vlastnosti heterostruktur GaInP.sub.2./sub./GaAs
Nohavica, Dušan ; Gladkov, Petar ; Žďánský, Karel
Growth of the Ga.sub.x./sub.In.sub.1-x./sub.P/GaAs(100) heterostructures from the liquid phase was optimized at 800.sup.o./sup.C to obtain thick epitaxial layers. Experimental conditions for growth of the mirror like, morphological defects free structures are very narrow. Capping of the ternary layer by GaAs grown from the Bi or Bi-Ga melt was investigated as well. New model of the substrate planarity related defects has been suggested.
Doba života nosičů náboje a Seebeckův koeficient v polovodičích
Vacková, S. ; Gorodynskyy, Vladyslav ; Žďánský, Karel ; Vacek, K. ; Kozak, Halina
The lifetime of carriers represents an important parameter of radiation detectors which is characteristic for them. Usually the current experimental technique for their measurement makes use of different experimental methods, as photoconductivity. Very often the product of mobility and lifetime is introduced as a criterion for the semiconductor suitability of radiation detection.
Příprava dopovaných a kodopovaných monokrystalů fosfidu inditého
Pekárek, Ladislav ; Žďánský, Karel
Indium phosphide crystals doped with various impurity atoms were grown by liquid encapsulation Czochralski method. The wafers of the grown crystals were characterized by resistivity an Hall measurements and their suitability for radiation detection was assessed.

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