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  • 1
    Electronic Resource
    Electronic Resource
    Energy spectrum of acceptors in the semimagnetic semiconductors p-Hg1−x MnxTe in the spin-glass region (1998)
    Springer
    Semiconductors 32 (1998), S. 401-403 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The far-IR transmission and photoconductivity in the semimagnetic alloys p-Hg1−x MnxTe (x=0.20–0.22) at temperatures 2–7 K were investigated at fixed frequencies of optically pumped molecular lasers in the region 49–311 µm. We report the observation of photoexcitation of acceptors from the ground into excited states under conditions when the direct interaction of the magnetic moments of the manganese ions becomes substantial and results in the formation of a spin-glass phase. It was found that the internal field produced by the spontaneous and external polarizations of the magnetic moments of the Mn2+ ions in the spin-glass temperature range influences the energy spectrum of acceptors in a magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187403
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  • 2
    Electronic Resource
    Electronic Resource
    Modification of the electron spectrum and vibrational properties of amorphous carbon by copper doping (1998)
    Springer
    Semiconductors 32 (1998), S. 831-837 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The near-gap electron spectrum and the effective charge distribution in graphite-like carbon nanoclusters of simple geometry in a-C: H containing a single Cu atom are calculated in the tight-binding approximation. Only the coupling between π electrons of the constituent C atoms and one valence s electron of the Cu atom is taken into account. The binding energy of the Cu atom in the clusters and the static dipole moment of the clusters are calculated. The results are invoked to interpret the experimentally observed activation of the Raman G band in the IR spectrum of a-C: H: Cu as a consequence of a lowering of the symmetry of the graphite-like clusters due to copper intercalation. Experimental data on the time dependence of the G band intensity during isothermal annealing of a-C: H: Cu are presented. The data suggest the possibility of reversible transfer of Cu atoms between the impurity states in the copper-carbon clusters and the impurity states in the purely copper clusters. The average activation energies of direct and reverse transfer are estimated from the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187468
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  • 3
    Electronic Resource
    Electronic Resource
    Multimode nature and magnetophonon resonance of quaternary solid solutions of zinc, cadmium, and mercury tellurides (1998)
    Springer
    Semiconductors 32 (1998), S. 901-909 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The magnetophonon resonance in a multimode crystal of the solid solution ZnxCdyHg1−x−y Te (x=0.08, y=0.11) was investigated in the temperature interval from 77 to 200 K. To interpret the obtained structure of the magnetophonon resonance spectrum, the phonon modes of three compositions of this solid solution were studied by the Raman scattering method. The results presented confirm the three-mode behavior (excluding cluster modes) of the phonon spectrum of the solid solutions of this class. The complicated structure of the magnetophonon resonance bands is interpreted on the basis of the values obtained for the phonon frequencies. The characteristic features of electron transport in such a lattice are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187481
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  • 4
    Electronic Resource
    Electronic Resource
    Vitali $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} $$ Ivanovich Stafeev (on his 70th birthday) (1999)
    Springer
    Semiconductors 33 (1999), S. 479-480 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187716
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  • 5
    Electronic Resource
    Electronic Resource
    Growth of a-C:H and a-C:H〈Cu〉 films produced by magnetron sputtering (2000)
    Springer
    Semiconductors 34 (2000), S. 98-103 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Growth behavior of a-C:H and a-C:H〈Cu〉 films produced by the magnetron sputtering of a composite target consisting of graphite and copper plates in an argon-hydrogen atmosphere was studied by infrared spectroscopy, scanning electron microscopy, and ellipsometry. The introduction of copper into amorphous hydrogenated carbon films was shown to cause no marked changes in the carbon-hydrogen bonds in the matrix. In the a-C:H〈Cu〉 films ∼2 µm thick, a thin uniform layer (∼1000 Å) was found to adjoin the substrate; closer to the free surface, the layer acquires a columnar texture with columns oriented from the substrate to the surface. The results of ellipsometry measurements were analyzed in terms of a two-layer film model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187962
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication and photoelectronic properties of ZnTe single crystals and Schottky diodes (2000)
    Springer
    Semiconductors 34 (2000), S. 1275-1280 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract n-and p-ZnTe single crystals were grown by the method of the gaseous-phase reactions using various halogen-containing agents (NH4Cl, NH4Br, and NH4I) as the carrier gases. Luminescent properties of the crystals were studied in relation to the type of the carrier gas. In/ZnTe Schottky barriers were formed. The photovoltaic effect was studied in the obtained structures for cases of natural and linearly polarized radiation. It was ascertained that the induced photopleochroism of the Schottky barriers is controlled by the angle of incidence of radiation and remains unchanged in the region of high photosensitivity. It is concluded that the obtained barriers may be used as broadband photosensors of linearly polarized radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1325422
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  • 7
    Electronic Resource
    Electronic Resource
    Optoelectronic effects in semi-insulating CdTe single crystals and structures based on them (1999)
    Springer
    Semiconductors 33 (1999), S. 518-522 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The authors describe a gas-transport reaction method they recently developed using the compounds NH4Cl (Br, I) as transport agents. Using this method, they were able to grow semiinsulating cadmium telluride single crystals with carrier concentrations p=108–1010 cm−3 at T=300 K. These crystals were used to fabricate In-CdTe surface-barrier structures with peak voltaic photosensitivities of ∼105 V/W. Their investigations of the emission properties of homogeneous crystals at T=77K and distinctive features of their photosensitivity spectra revealed that these material characteristics derive from the use of Cl, Br, and I as dopants. By illuminating their In-CdTe structures with linearly polarized light at oblique incidence, they generated induced photopleochroism, which was measured and used to determine the refraction index of the material, which is found to be n=2.8. The paper concludes with a discussion of how these structures can be used as photodetectors of natural and linearly polarized light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187720
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  • 8
    Electronic Resource
    Electronic Resource
    Scanning tunneling spectroscopy of amorphous carbon: Tunneling model (1999)
    Springer
    Technical physics letters 25 (1999), S. 999-1000 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis is made of a model of tunnel current flow through amorphous diamond-like carbon. It is shown that single-electron phenomena may occur in this medium which result in the appearance of specific features on the current-voltage characteristics of thin amorphous carbon films. The model is used to explain the tunnel spectra of diamond-like carbon and the size of a graphite-like cluster is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262707
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  • 9
    Electronic Resource
    Electronic Resource
    The scanning tunneling microscopy and scanning tunneling spectroscopy of amorphous carbon (2000)
    Springer
    Semiconductors 34 (2000), S. 1355-1362 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The most important methods for studying the surface of amorphous diamond-like carbon are scanning tunneling microscopy and scanning tunneling spectroscopy. In this review, publications concerned with studying the topography and electronic properties of the surface of amorphous diamond-like carbon films using a tunneling microscope are considered; related publications devoted to the microprobe study of field emission from amorphous carbon and to the tunneling microscopy of metal-carbon nanocomposites are also reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1331790
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  • 10
    Electronic Resource
    Electronic Resource
    Vibration modes of carbon in hydrogenated amorphous carbon modified with copper (2000)
    Springer
    Semiconductors 34 (2000), S. 1391-1396 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Activation in IR absorption of quasi-Raman vibration modes of graphene planes was studied in a-C:H modified with copper; these modes are forbidden in the absence of copper. Parameters of the quasi-Raman bands G and D in optical absorption in the region of carbon-carbon mode vibrational frequencies and the parameters of true Raman bands are compared in the Raman spectra of pure a-C:H and in that modified with copper. It is stated that the close coincidence of the frequencies of the true Raman bands in a-C:H and quasi-Raman bands in a-C:H(Cu) indicates that the interaction of copper atoms with the carbon matrix leaves the graphene rings practically intact and can be regarded as intercalation. To identify the observed quasi-Raman and the satellite bands, correlations between their parameters are considered. The sizes of graphite-like clusters and their dependence on the copper content in the film were evaluated from the ratios between the integrated intensities of D and G bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1331797
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