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  • American Institute of Physics (AIP)  (179)
  • Canadian Science Publishing  (36)
  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction analysis of Si1−xGex/Si superlattices (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3474-3479 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Si1−xGex/Si strained-layer superlattices grown by molecular-beam epitaxy on Si substrates were investigated by x-ray double-crystal diffraction and x-ray grazing incidence diffraction. Both coherent and incoherent interfaces between the two components of the superlattices were observed. By fitting computer-simulated double-crystal x-ray-diffraction rocking curves to the experimental data, it is determined that there exist graded variations in both the component thickness ratio t1/t2 (t1 and t2 are the thickness of the Si1−xGex and the Si layers, respectively) and the fraction x in one sample. The x-ray grazing incidence diffraction experiments reveal a lattice strain relaxation of about 27% in another sample. The lattice relaxation and the influence of variations of x and t1/t2 on the rocking curves are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351423
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  • 2
    Electronic Resource
    Electronic Resource
    Coherent continuous wave operation of 10×10×2 grating-surface-emitting diode laser array in a ring configuration (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7645-7647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coherent cw operation of a 10×10×2 grating-surface-emitting diode laser array in a ring configuration is demonstrated. At near twice the threshold current, the ring array exhibits a high degree of spatial coherence (an average of 86%) between emitting grating sections and a narrow linewidth of 28 MHz. The far field fringe visibility is 80% and 88% in the lateral and longitudinal directions, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350363
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  • 3
    Electronic Resource
    Electronic Resource
    Room-temperature continuous operation of GaAs/AlGaAs lasers grown on Si by organometallic vapor-phase epitaxy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1916-1918 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Graded-index separate-confinement heterostructure single-quantum-well GaAs/AlGaAs diode lasers exhibiting continuous (cw) operation at room temperature have been grown on a Si substrate by organometallic vapor-phase epitaxy, without the use of molecular-beam epitaxy. To improve the quality of the laser structure, a defect-filtering layer was incorporated between this structure and a GaAs buffer layer about 1.5 μm thick grown on the substrate. Of four types of defect-filtering layers investigated, the most effective was one grown with thermal cycling, which made it possible to obtain pulsed threshold current densities as low as 350 A/cm2 for broad-stripe lasers with a cavity length of 500 μm. Ridge-waveguide lasers with this type of defect-filtering layer have exhibited cw threshold currents as low as 25 mA and a differential quantum efficiency of 55%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346583
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  • 4
    Electronic Resource
    Electronic Resource
    A new technique to decompose closely spaced interface and bulk trap states using temperature dependent pulse-width deep level transient spectroscopy method: An application to PT/CdS photodetector (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 760-766 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel method is presented here to experimentally decompose nonexponential capacitive transients into the appropriate components from the closely spaced deep trap states. Using temperature dependent pulse-width deep level transient spectroscopy (TDP-DLTS) technique, we show for the first time that two bulk trap states and one continuously distributed interface states in (Pt/CdS) photodiodes can be successfully separated. The basic principle is to set the applied pulse width to follow an averaged temperature-dependent capture time constant and divide the DLTS spectrum. In the example of Pt/CdS photodiodes, we show that all physical parameters including thermal activation energies, capture cross sections, and trap densities are more accurately calculated after each component is separated from others. The origins for those bulk traps and interface states are also discussed. Without any complicated mathematics or program, TDP-DLTS can be applied to both large and small voltage pulse DLTS measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353334
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  • 5
    Electronic Resource
    Electronic Resource
    Heteroepitaxial multilayer of YBa2Cu3O7 and PrBa2Cu3O7 on SrTiO3 and LaAlO3 substrates by sputtering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2072-2074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have successfully fabricated epitaxially grown YBa2Cu3O7/PrBa2Cu3O7 (YBCO/PBCO) multilayer thin films on SrTiO3 and LaAlO3 substrates by dc/rf magnetron sputtering. The thicknesses of YBCO and PBCO varied from 1 to 8 unit cells. Satellite peaks in x-ray diffraction patterns clearly indicate the formation of periodic modulation structures of different wavelengths. At a certain thickness of the YBCO layer, the zero resistance transition temperature Tc0 decreased with the increase of the PBCO layer thickness. In contrast, Tc0 increased with the increase of the YBCO layer thickness at a constant PBCO layer thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351640
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  • 6
    Electronic Resource
    Electronic Resource
    13.4% efficient thin-film CdS/CdTe solar cells (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7608-7612 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cadmium telluride is a promising thin-film photovoltaic material as shown by the more than 10% efficient CdS/CdTe heterojunction solar cells. In this work, thin-film CdS/CdTe solar cells have been prepared using CdS films grown from an aqueous solution and p-CdTe films deposited by close-spaced sublimation (CSS). The properties of CdS films deposited from an ammonical solution of a Cd-salt, an ammonium salt, and thiourea have been controlled by optimizing the temperature and composition of the solution. The solution-grown CdS films have a high photoconductivity ratio, and its optical transmission is superior to that of vacuum evaporated CdS films. The properties of p-CdTe films deposited by CSS have been optimized by controlling the temperature and composition of the source material, and the substrate temperature. The properties of CdS/CdTe heterojunctions have been studied; junction photovoltage spectroscopy is used for the qualitative comparison of junction characteristics. Solar cells of 1-cm2 area with an AM 1.5 efficiency of 13.4% are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349717
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  • 7
    Electronic Resource
    Electronic Resource
    Magneto-optical properties and temperature dependence of SmCoDy films with perpendicular magnetic anisotropy (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5997-5997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous LRE-TM SmCo perpendicular magnetic film provides a promising candidate for perpendicular magnetic recording media.1 In order to improve the magneto-optical properties of SmCo films, we have studied the ternary system: Smy(Co100−xDyx)100−y films which were prepared by rf magnetron sputtering system. Because the Dy moment is antiferromagnetically coupled to the Co moment and Dy has a larger magnetic anisotropy, Dy addition will increase Ku and decrease Ms of LRE-TM films. With the Dy addition content increased from 0 to 10 at. %, the perpendicular anisotropy constant K⊥ (K⊥ = Ku(K⊥=Ku− 2πM2s) increased to improve the magneto-optical properties of SmCo films. The torque curve measurement and Kerr hysteresis loop of SmCoDy film had proved it was perpendicular magnetic film. In order to prevent RE metal selective oxidation of SmCoDy films, a protective layer AlN was used. AlN films were prepared by rf reactive sputtering.2 The temperature dependence of AlN/SmCoDy/glass were studied. Hc decreased rapidly when temperature increased while its Kerr angle decreased slightly. When the sample was cooled to room temperature, Hc and θk returned to its original value. The results show SmCoDy films may become new material of magneto-optical recording media. The long-term stability and microstructure of SmCoDy films have also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347790
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  • 8
    Electronic Resource
    Electronic Resource
    Dielectric and pyroelectric properties of lithium sodium niobate ceramics at low temperature (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2522-2524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dielectric and pyroelectric properties of lithium sodium niobate ceramics are investigated between the temperature range 320–120 K. The result is indicative of a first-order ferroelectric-ferroelectric phase transition at low temperature with a large thermal hysteresis. At temperatures near the phase transition, an unusual pyroelectric response is observed, which is attributed to the coexistence of the two ferroelectric phases. The result is in agreement with the measurement we made on the lithium sodium niobate single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348690
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  • 9
    Electronic Resource
    Electronic Resource
    Femtosecond spectroscopic study of ultrafast carrier relaxation in hydrogenated amorphous silicon a-Si:H (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1235-1239 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a study of spectral- and time-resolved reflectivity and transmission measurements on hydrogenated amorphous silicon (a-Si:H) with 50 fs time resolution. Electron-hole pairs are photoexcited into the extended states of a-Si:H by an ultrashort pump pulse at (h-dash-bar)ω=2 eV. The temporal evolution of the photoinduced optical response is studied for a broad range of excitation densities from 1018 up to 1020 cm−3, and on a timescale of up to 200 ps. The temporal evolution of the optical response is discussed in terms of recombination and trapping mechanisms for carriers in the extended states of a-Si:H.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353263
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  • 10
    Electronic Resource
    Electronic Resource
    Depolarized light scattering and dynamic shear compliance of viscoelastic liquids (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 508-514 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Efforts are made to relate the depolarized light scattering spectral power density to the dynamic shear compliance spectrum of a viscoelastic liquid. Generalized Langevin equations are used to describe the dynamics and coupling of reorientation and translational motions. It is shown that in the presence of the coupling, the depolarized scattering spectrum consists of two components; one is associated with the reorientational motion, and the other with the viscoelastic relaxation of the solution. Methods to obtain the dynamic shear compliance from the depolarized light scattering spectrum are described. It is also shown that in the limit of very slow reorientational motion, the depolarized light scattering spectrum is proportional to the imaginary part of the dynamic compliance spectrum, a result predicted by the Pockels photoelastic law.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463597
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