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	PD NANOLAYERS FOR HYDROGEN SENSORS Yatskiv, Roman ; Žďánský, Karel ; Grym, Jan ; Piksová, K. We presented study nanoparticle layers created by electrophoretic deposition. A possibility of using Pd nanolayers for the formation of Schottky barriers with a large Schottky barrier height (SBH) value on n-type tin doped InP is proposed together with its potential application in high-sensitive hydrogen sensors. Detailed record
	STUDY OF ELECTROPHORETIC DEPOSITION OF Pd METAL NANOPARTICLES ON InP AND GaN CRYSTAL SEMICONDUCTORS FOR H2 GAS SENSORS Žďánský, Karel ; Yatskiv, Roman ; Grym, Jan ; Černohorský, O. ; Zavadil, Jiří ; Kostka, František Deposition of Pd nanoparticles (NPs) on InP or GaN single crystal wafer was performed from isooctane colloid solution. Diodes were prepared by making Schottky contact with colloidal graphite on Pd NPs partly coated surface and ohmic contact on the blank side of the wafer. It was found that several ppb of hydrogen in nitrogen gas can be detected by monitoring the change of diode current at a constant bias voltage. Diodes made on GaN were about ten times more sensitive to hydrogen than those made on InP. Detailed record
	Microscopy of nanoparticles and films with nanoparticles Kacerovský, Pavel ; Žďánský, Karel ; Procházková, Olga ; Vaniš, Jan ; Grym, Jan ; Vasiliev, A. ; Pašajev, E. M. To study the electrophoreticaly deposited nanolayers of reverse micelles with Pd nano-particles on n-type InP substrates a wide range of current microscopic methods has been used. What concerns analytical methods the X-ray diffraction and mass spectrometry SIMS were used. The most relevant results about Pd nanoparticles in the layer were obtained by using HRTEM microscopy and SIMS spectrometry. In nanolayers crystallographic arrangement of Pd nanoparticles has not been found. Detailed record
	Control system of the laser topographer Kostka, František ; Žďánský, Karel ; Zavadil, Jiří ; Starý, Robert Universal apparatus for measuring photoluminescence over surface of semiconductor samples was designed and realized. Detailed record
	Control system of the Heat Flux furnace Kostka, František ; Zelinka, Jiří ; Kostka, Petr ; Houška, Zdeněk ; Zavadil, Jiří ; Starý, Robert ; Krechler, Jindřich ; Žďánský, Karel A control system for a two-crucible furnace for DTA has been designed and realized. Samples of heavy metal oxide glasses have been analysed by the system. Detailed record
	GROWTH OF InP CRYSTALS WITH RARE-EARTH ELEMENTS Yatskiv, Roman ; Grym, Jan ; Žďánský, Karel ; Pekárek, Ladislav ; Zavadil, Jiří We report on the influence of rare earth (RE) elements (Pr, Er, and Dy) addition during vertical Bridgman low pressure synthesis on the properties of InP crystals. The temperature dependent Hall measurement and low temperature photoluminescence (PL) spectroscopy were employed to study the changes in electrical and optical properties of the crystals. The observed changes are attributed to the gettering effect of REs caused by the high affinity of REs towards shallow impurities in InP. Detailed record
	LPE Growth of III-V Semiconductors from rare-earth Treated Melts Grym, Jan ; Procházková, Olga ; Zavadil, Jiří ; Žďánský, Karel We focus on the characterization of InP and InGaAsP layers prepared by liquid phase epitaxy with rare-earth admixtures. We applied photoluminescence spectroscopy (PL), capacitance-voltage measurements, and secondary ion mass spectroscopy in order to explain: (i) the gettering effect and conductivity crossover of InP layers for Pr treated samples, (ii) narrowing of the PL and elecroluminescent spectra of the active InGaAsP region of a double-heterostructure LED. Detailed record
	Films of Metal Nanoparticles Deposited on Semiconductors by Electrophoresis: Technology and Characterization Žďánský, Karel ; Zavadil, Jiří ; Kacerovský, Pavel ; Kostka, František ; Lorinčík, Jan ; Černohorský, O. ; Fojtík, A. ; Müller, M. ; Kostejn, M. Layers of nanoparticles in micelle enclosures were deposited on InP substrates by electrophoresis from isooctane colloid solutions containing Pd or Ag nanoparticles. The layers were investigated by SIMS, low-temperature photoluminescence spectroscopy and topography, absorption spectroscopy, Raman spectroscopy and sensitivity to hydrogen. Photoluminescence of InP was enhanced by the layers of Pd or Ag nanoparticles. Schottky barriers made on the n-type InP with layers containing Pd nanoparticles showed significant sensitivity to hydrogen in contrast to those containing Ag nanoparticles. Detailed record
	Control system for laser topograph Kostka, František ; Žďánský, Karel ; Starý, Robert ; Šmíd, A. ; Krechler, Jindřich The goal of the laser-topograph control systems is the measured sample positions control in the perpendicular plane to the direction of the laser beam and data sampling from lock-in-amplifier. The lock-in-amplifier is detecting the secondary luminescence light from the measured sample. Detailed record
	Srovnávací studie heterostruktur s kvantovými jámami pomocí tranzientní spektroskopie hlubokých hladin Kosíková, Jitka ; Žďánský, Karel ; Rudra, A. ; Kapon, E. Deep level transient spectroscopy (DLTS) and capacitance-voltage measurements have been made on AlGaAs/GaAs diode structures containing quantum wells (QW) prepared with graded and with step aluminium content as well as on structures without QWs.A new DLTS peak has been observed in the structures containing QWs, either with graded or with step structure. Mechanisms of electron transitions explaining the new results has been discussed. Detailed record

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