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The electronic conduction mechanism through grain boundaries in heteroepitaxial gallium nitride layers was explained by applying the model, which included three effects: thermionic emission over potential barrier, thermionic field emission through potential barrier and thermionic field emission through scattering barrier. Space charge potential barriers height at the grain boundary layer was estimated...
Al-doped ZnO films were prepared by the dc magnetron sputtering technique on Suprasil-1 substrates at a temperature of 470K. Plasma-emission monitoring was used to stabilize oxygen flow to the deposition chamber. The effect of substrate position during deposition on the structural, electrical and optical properties of the films was investigated. It was found that preparation of low-resistance films...
Results of mass spectrometric investigations of soot by using the laser desorption/ionization (LDI) method and time of flight (TOF) mass spectrometry are presented. Several liquid fuels (benzene, tetrahydrofuran, toluene, acetonitrile, acetone, isopropanol, ethanol) were used to produce soot samples. Each soot gives specific mass spectrum of carbon clusters C n as well as their size. The best...
Investigations of ion–molecule reactions were performed for methane–carbon tetrafluoride mixtures of different compositions. Concentration of methane in these mixtures ranged from 10% to 90% (at 10% increment) and total mixture pressure was fixed at 13.3Pa. Measurements were made using a quadrupole mass spectrometer with a high-pressure ion source. Primary ions CH 4+ , F + , CF...
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