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  • American Institute of Physics (AIP)  (14)
  • Oxford University Press  (14)
  • EDP Sciences  (5)
  • Copernicus  (3)
  • Blackwell Publishing Ltd  (1)
  • 2015-2019  (12)
  • 2010-2014  (9)
  • 1990-1994  (6)
  • 1985-1989  (10)
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  • 1
    Digitale Medien
    Digitale Medien
    Analysis of recombination centers in (AlxGa1−x)0.5In0.5P quaternary alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4946-4949 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We studied nonradiative recombination centers in undoped (AlxGa1−x)0.5In0.5Pgrown by metalorganic vapor phase epitaxy using transient capacitance spectroscopy. We found three deep energy levels, including a mid-gap level. We drew an equation to get a capture cross section for minority carriers, and obtained it using isothermal capacitance transient spectroscopy measurement. The mid-gap level had an electron capture cross section of 2 × 10−10 cm2 and a hole capture cross section of 1 × 10−15 cm2. The time constant of nonradiative recombination through the mid-gap level was found to be comparable to that of radiative recombination. We concluded that the mid-gap level is an effective nonradiative recombination center that reduces photoluminescence intensity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349041
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  • 2
    Digitale Medien
    Digitale Medien
    Resistometric and Mössbauer studies on structural relaxation in (Ni,Fe)75Si10B15 metallic glasses (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2091-2099 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The structural relaxation in (Ni,Fe)75Si10B15 metallic glasses has been studied by measuring resistivity changes and Mössbauer spectra. The sign and magnitude of resistivity changes due to the relaxation depend strongly on the Ni/Fe ratio. The isothermal resistivity changes fit well the nonlinear kinetic form, indicating that the fluctuation of local environments of Ni and Fe atoms is very large and Ni and Fe atoms in Ni-Fe-Si-B metallic glasses are mobile compared with Co and Fe atoms in Co-Fe-Si-B metallic glasses. The compositional dependence and kinetic parameters for reversible resistivity changes and Mössbauer spectra strongly support that the reversible structural relaxation corresponds to the reversible short-range ordering between Ni and Fe atoms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346563
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  • 3
    Digitale Medien
    Digitale Medien
    Low frequency (1/f) noise in YBa2Cu3O7−δ grain boundary junction dc superconducting quantum interference devices (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1895-1898 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have studied low frequency (1/f) noise of YBa2Cu3O7−δ dc superconducting quantum interference devices (SQUIDs) on SrTiO3 bicrystal substrates. 1/f flux noise, either measured at different temperatures for optimized bias current or measured at 77 K for different bias currents, is almost constant. These facts imply that 1/f noise mainly comes from fluctuations of the critical current of the Josephson junction that form the SQUID. Also, we explain the critical current fluctuations in the junction by an equilibrium temperature fluctuation model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357714
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  • 4
    Digitale Medien
    Digitale Medien
    High-purity GaSb epitaxial layers grown from Sb-rich solutions (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 239-240 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Undoped GaSb crystals with mirror-like surfaces were obtained by liquid phase epitaxy from Sb-rich solutions. The background carrier concentration strongly depended on the growth temperature. By growing crystals below 600 °C, we can obtain a GaSb crystal with a background carrier concentration under 1016 cm−3. Photoluminescence studies showed that native defects related to Sb vacancies were significantly reduced in the GaSb crystal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102842
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  • 5
    Digitale Medien
    Digitale Medien
    Liquid phase epitaxial growth of Fe-doped semi-insulating InGaAsP lattice matched to InP over the entire composition range (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 574-576 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Fe-doped semi-insulating In1−x Gax Asy P1−y (0≤y≤1, y=2.2x) epitaxial layers lattice matched to InP with nearly intrinsic carrier concentrations have been successfully grown over the entire composition range by liquid phase epitaxy. Maximum resistivities as high as 8×107 Ω cm for InP, 2×105 Ω cm for InGaAsP (y=0.57), and 2×103 Ω cm for InGaAs (y=1) have been achieved. The critical growth temperature necessary to obtain semi-insulating layers significantly decreased as the composition was varied from y=0 to y=1. The Fe doping characteristics are well defined by the composition dependence of the Fe distribution coefficient.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99861
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  • 6
    Digitale Medien
    Digitale Medien
    Room-temperature exciton optical absorption peaks in InGaAsP/InP multiple quantum wells (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1353-1355 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We grew In1−xGaxAsyP1−y/InP quantum wells (QWs) by low-pressure metalorganic vapor phase epitaxy. The In1−xGaxAsyP1−y layer was closely lattice matched to InP with a composition of y=0.9 (x=0.47y). We investigated structural imperfections such as composition fluctuations, interface roughness, and nonperiodicity analyzing the low-temperature photoluminescence linewidth. We found that the InGaAsP layer composition fluctuated, causing about 5 meV inhomogeneity in the exciton energy level in QWs wider than about 3 nm. Since we obtained very smooth interfaces with less than one monolayer of fluctuation and excellent periodicity by lowering growth temperature to 570 °C, the inhomogeneity of the exciton energy level could be held at 6 meV for 20-period 10-nm multiple QWs. As a result, despite composition fluctuations, a clear room-temperature exciton optical absorption peak was observed at 1.5 μm for the first time to our knowledge.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100713
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  • 7
    Digitale Medien
    Digitale Medien
    Exact determination of superlattice structures by small-angle x-ray diffraction method (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 742-744 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The structure of In1−xGaxAsyP1−y/InP superlattices (x=0.27 and y=0.60) is investigated by small-angle x-ray diffraction method. The interference peaks due to the superlattice structure were clearly observed up to the 6th order. The period of the superlattice was determined from the angular positions of the peaks using the modified Bragg's law. By analyzing the diffraction patterns of the first and the secondary peaks according to the optical multilayer theory, the thickness of each component (In1−xGaxAsyP1−y and InP) was uniquely determined within an error of ±1 A(ring). This method can be used to determine any type of superlattice structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99342
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  • 8
    Digitale Medien
    Digitale Medien
    Evaluation of exciton absorption peak broadening factors in InGaAsP/InP multiple quantum wells (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2290-2292 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We evaluated the magnitude of broadening factors of ground-state exciton absorption peaks in In1−xGaxAsyP1−y/InP (x=0.47y) multiple quantum wells (MQW's) with about 10 nm wells. The absorption peaks broadened with a decrease of y. Analyzing the absorption peak broadening with increasing temperature, the thermal broadening factor at 300 K was found to be about 9 meV and composition independent. Analyzing the photoluminescence linewidth at 4.2 K, it was found that composition fluctuations in the well caused an inhomogeneity of the exciton energy level of 4.4 meV for the y=1.0 MQW and 7.5 meV for the y=0.6 MQW, being the greatest contributors to inhomogeneous broadening. We conclude that the exciton absorption peak broadening with a decrease of y is primarily due to the increase of composition fluctuations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100256
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  • 9
    Digitale Medien
    Digitale Medien
    Photoionization cross section of In0.49Ga0.51P:Fe (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 529-531 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We determined spectral dependence of the photoionization cross section of the Fe acceptor in In0.49Ga0.15P by photocapacitance spectroscopy. As a result of the alloy effect we observed the nonexponential photocapacitance transient. We treated it with a model of the energetically broadened defect level. Optical thresholds for 5E and 5T2 of the crystal-field-split Fe acceptor level are 0.78 and 1.15 eV at 77 K. The small difference of 40 meV between the optical and thermal activation energies for the transition from the valence band to 5E reveals the weak coupling between the Fe acceptor level and the lattice vibration of InGaP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100920
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  • 10
    Digitale Medien
    Digitale Medien
    Photoionization cross section of InP:Fe (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3933-3936 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The spectral dependence of the photoionization cross section of Fe doped in InP is determined by photocapacitance spectroscopy. The optical process of the carrier emission from the deep acceptor level of Fe is discussed from the results. For the crystal-field-split level of Fe2+:5E, the photoionization cross sections for the fundamental transitions of 5E→Γ1 and Γ15→5E are adequately described by the Lucovsky model. Those optical thresholds are 0.63 and 0.78 eV, respectively, at 77 K. In comparison with the deep-level transient spectroscopy measurements, the following conclusions are obtained. The energy separation between the Fe acceptor level and the conduction-band edge is constant, but that between the Fe level and the valence-band edge varies correspondingly to the temperature variation of the InP band-gap energy. The fact that there is no difference between the optical and thermal activation energies for the 5E→Γ1 transition indicates that the Fe acceptor level is not perturbed by the InP lattice vibration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343358
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