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  • 1
    Digitale Medien
    Digitale Medien
    Tunneling-injection-induced turnaround behavior of threshold voltage in thermally nitrided oxide n-channel metal-oxide-semiconductor field-effect transistors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6299-6303 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The threshold voltage (VT) degradation metal-oxide-semiconductor field-effect transistors (MOSFETs) with thermally nitrided oxide or pure oxide as gate dielectric was determined under Fowler–Nordheim (FN) stressing. A typical VT turnaround behavior was observed for both kinds of devices. The VT for nitrided oxide MOSFETs shifts more negatively than that for pure oxide MOSFETs during the initial period of FN stressing whereas the opposite is true for the positive shift after the critical time at turnaround point. The discovery that the shift of substrate current peak exhibits similar turnaround behavior reinforces the above results. In the meantime, the field-effect electron mobility and the maximum transconductance in the channel for nitrided oxide MOSFETs are only slightly degraded by stressing as compared to that for pure oxide MOSFETs. The VT turnaround behavior can be explained as follows: Net trapped charges in the oxide are initially positive (due to hole traps in the oxide) and result in the negative shift of VT. With increasing injection time, trapped electrons in the oxide as well as acceptortype interface states increase. This results in the positive shift in VT. It is revealed that VT degradation in MOSFETs is dominated by the generation of acceptortype interface states rather than electron trapping in the oxide after the critical time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346872
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  • 2
    Digitale Medien
    Digitale Medien
    Internal explosion in laser ablation of superconducting targets (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4227-4231 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The temperature profile inside a superconducting target in laser ablation is calculated for laser pulses of various shapes. The calculation is based on the equation of heat conduction. All parameters characterizing the target material are assumed to be temperature dependent and are determined empirically by extrapolating experimental data to the melting point. The receding velocity of the vapor-solid interface is determined by the dynamical balance of energy. Our calculation shows that, in general, there exist subsurface overheating spots at different instants as long as the laser pulse intensity is strong enough. The dependence of their occurrence on the pulse shape is analyzed, and conditions to avoid them without jeopardizing the deposition process are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.352234
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  • 3
    Digitale Medien
    Digitale Medien
    Transmission electron microscopy study of V-Sr-Tl-O system (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1057-1059 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated the structure of V-Sr-Tl-O system with transmission electron microscopy. The majority phase in VSrTl0.2Oy samples with a sharp resistivity drop around 165 K is identified as V2Sr0.6TlδOy with δ ranging from 0.01 to 0.04. This phase has a hexagonal structure, with point group 6/mmm, space group P6/mmm, and lattice parameters a=0.569 nm and c=1.284 nm. Upon in situ cooling from room temperature to 130 K, no evidence of structure change is observed. When the crystals of V2Sr0.6TlδOy are heated in situ, two superstructures are formed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349695
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  • 4
    Digitale Medien
    Digitale Medien
    Density dependence of excess electronic ground-state energies in simple atomic fluids (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2002-2021 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The ground-state energies of an excess electron E0 as a function of solvent density are computed using model electron–atom pseudopotentials in fluid helium, argon, and xenon. E0 is a lower bound to the experimentally measurable threshold to photoconductivity, V0. The nonuniqueness of the pseudopotential description of electron–molecule interactions is demonstrated. We find that when many-body polarization effects are included, our calculated E0 results are in close agreement with experimental V0 values indicating that the conduction-band energy lies close to the ground-state energy across a broad range of densities in these polarizable fluids. If the many-body nature of the polarization interaction is ignored the ground-state energies deviate significantly from the V0 results highlighting the importance of accurate treatment of many-body polarization interactions. It is shown that a mean-field theory of polarization gives substantial agreement with full many-body calculations. This allows us to introduce a mean-field, density-dependent pair potential which greatly simplifies such many-body calculations. In the more polarizable systems, it is found that the spatial extent of the ground-state wave function as a function of solvent density is correlated with the density dependence of both V0 and the electron mobility, and it becomes uniformly spread throughout our simulation cell as the electron mobility goes through its maximum value at intermediate solvent densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463138
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  • 5
    Digitale Medien
    Digitale Medien
    Photoemission studies of Ru3(CO)12 adsorption and formation of Cu–Ru bimetallics on Cu(111) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6250-6255 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoemission spectra of Ru3(CO)12 adsorbed on Cu(111) and its decomposition products induced by electron irradiation and annealing are reported. It is found that electron bombardment and subsequent annealing of Ru3(CO)12/Cu(111) lead to the formation of Cu–Ru bimetallic aggregates which exhibit similar features as those reported previously on polycrystalline Cu, that is that Ru–Cu aggregates are formed of which Ru atoms are at the core and the surface is wetted with Cu and there exist distinct interface states. The mechanism for the formation of the bimetallic Cu–Ru aggregates on Cu(111) is almost certainly one in which two-dimensional Ru aggregation occurs on the surface upon initial annealing (∼225 °C) followed by three-dimensional aggregation and wetting of the Ru cluster surface by Cu after further annealing at higher temperatures ((approximately-greater-than)450 °C). The interaction between Ru surface intermediates and Cu(111) before Cu wetting occurs is also examined with photoemission and SW–Xα calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460414
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  • 6
    Digitale Medien
    Digitale Medien
    Photoemission studies of Ru3(CO)12 adsorption on Cu3Au (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4447-4452 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoemission spectra of Ru3(CO)12 adsorbed on polycrystalline ordered and disordered Cu3Au surfaces and its decomposition products induced by zero order light and electron bombardment are reported. The results are compared with multiple-scattering–X-alpha (MS–Xα) calculations and recent studies of Ru3(CO)12 on Cu.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.458727
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  • 7
    Digitale Medien
    Digitale Medien
    Reassignment of the valence photoelectron spectra of nickel diallyl complex Ni(.eta.3-C3H5)2 using variable energy photoelectron spectroscopy (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 5162-5163 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic00051a004
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  • 8
    Digitale Medien
    Digitale Medien
    Studies on diamondlike carbon films for antireflection coatings of infrared optical materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 705-707 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Diamondlike carbon (DLC) films were directly deposited onto germanium (Ge) and zinc sulphide (ZnS) slices by a capacitively coupled 13.56 MHz rf glow discharge plasma with Ar-C2H2 gas mixtures. The IR transmittance was measured using a Fourier-transform infrared spectrometer. The maximum values of the IR transmission of Ge and ZnS with DLC films on both sides are 99% and 95.8%, respectively, which come up to the theoretical values. A nonuniform DLC film, of which the refractive index gradually changes along the thickness, has been successfully deposited onto a Ge slice for the first time and the IR transmission of a nonuniform DLC film coated onto both sides of a Ge substrate at the wider wave band of 2.5–15 μm is over 85%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357813
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  • 9
    Digitale Medien
    Digitale Medien
    Scaling behavior of virgin magnetization curve of DyBa2Cu3Oy crystal prepared by melt-textured growth method (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1329-1330 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetization curves of a DyBa2Cu3Oy crystal prepared by the melt-textured growth method were measured from 10 to 85 K with the magnetic field parallel to the c axis. The scaling behavior of the virgin magnetization curves is observed and explained in terms of an extended Bean model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357796
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  • 10
    Digitale Medien
    Digitale Medien
    Epitaxial growth of RbTiOPO4 films on KTiOPO4 substrates by excimer laser ablation technique (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 8215-8217 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Transparent single-phase rubidium titanyl phosphate (RTP) films having excellent crystalline properties have been deposited by excimer laser ablation method on (001)- and (010)-oriented potassium titanyl phosphate (KTP) substrates, respectively. X-ray θ-2θ scans and pole figures showed that the laser-ablated RTP films grew epitaxially on, and had exactly the same orientations of, the underlying KTP substrates. X-ray photoelectron spectroscopy analysis revealed that the RTP films prepared with this method are nearly stoichiometric. It appears to be possible to use these films as waveguides having sharp waveguide/substrate interfaces. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357884
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