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  • 1
    Electronic Resource
    Electronic Resource
    CO2 laser processing of diffusion induced lattice imperfections in silicon: Experiment and theory (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2981-2988 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high-temperature diffusion of phosphorus into crystalline silicon causes the formation of electrically inactive phosphorus-rich precipitates near the surface. These precipitates decrease the carrier lifetime and mobility in the diffused layer, and thus lead to less than optimal diode characteristics of electrical junctions formed by diffusion of phosphorus into a p-type substrate. We show that the free-carrier absorption of a CO2 laser pulse can be used to completely dissolve the precipitates and remove dislocations in the diffused layer. Furthermore, we find that there are distinct advantages in depositing the pulse energy by way of free-carrier transitions, since the energy can be preferentially deposited in either confined doped layers or diffusion wells that are surrounded by lightly doped material. Our transmission electron microscopy results show that the annealing of the extended lattice defects is caused by melting of the near-surface region and subsequent liquid-phase epitaxial regrowth. Van der Pauw measurements are used to study the carrier concentration, mobility, and sheet resistivity of the samples before and after laser irradiation. The results of the electrical measurements show that there is a large increase in the carrier concentrations and a corresponding drop in the sheet resistivities of the laser irradiated samples. Using a Fourier transforminfrared spectrometer, we find that significant changes occur in the transmittance and reflectance spectra after CO2 laser annealing. Secondary ion mass spectrometry measurements are used to determine the redistribution of the phosphorus as a function of the pulse energy density. A time resolved pump-and-probe technique is utilized to measure the threshold for the onset of surface melting and the melt duration. We find that for energy densities greater than about 3 J/cm2, the reflectivity of the probe laser (at 633-nm wavelength) jumps rapidly to 70%, which is consistent with the reflectivity of liquid silicon. The interpretation of the laser induced changes in the electrical, optical, and structural properties is based on a thermal model, in which surface melting occurs for incident pulse energy densities exceeding a threshold value. Comparative calculations are reported for the melt depths and duration of surface melting, and good agreement is found. Other calculated results for the transient heating and cooling of the near-surface region are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339384
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of transition-metal elements on tellurium alloys for reversible optical-data storage (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4319-4322 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tellurium-based alloys are being applied to phase-change, reversible optical-data storage. In order to improve the disk performances, research efforts have been concentrated on increasing the erase speed (crystallization rate) while maintaining good film stability. We report, for the first time, that certain transition-metal elements added to Te-alloy films can substantially improve the rate of crystallization without any reduction of the amorphous-phase stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337476
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    In-plane epitaxial alignment of YBa2Cu3O7−x films grown on silver crystals and buffer layers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1836-1838 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting YBa2Cu3O7−x (YBCO) films were grown by laser ablation on Ag(001), Ag(110), and Ag(111) single-crystal surfaces. X-ray diffraction measurements showed that, in all cases, the films were aligned with specific in-plane epitaxial orientation with respect to the crystallographic axes of the substrate. The observed orientations were consistent with predictions of near-coincident site lattice models of the YBCO-Ag interface. This technique for achieving three-dimensional film alignment was extended to include a Ag epitaxial buffer layer on mica in place of a bulk Ag crystal. In-plane epitaxial alignment on metal substrates and buffer layers has important consequences in practical applications for inhibiting weak-link behavior caused by high-angle grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109565
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Laser Processing of Semiconductor Materials (1982)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 12 (1982), S. 323-350 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.12.080182.001543
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  • 5
    Electronic Resource
    Electronic Resource
    Metabolic studies in familial partial lipodystrophy of the lower trunk and extremities (1975)
    Springer
    Diabetologia 11 (1975), S. 561-568 
    Details
    ISSN: 1432-0428
    Keywords: Lipodystrophy ; lipoatrophy ; partial lipodystrophy ; adipose tissue ; black adrenal adenoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A familial syndrome of partial lipodystrophy inherited as a dominant trait is reported. Subcutaneous fat loss was confined to the extremities and trunk. Diabetes mellitus, hyperlipidemia, hepatomegaly and renal disease were very prevalent in this family. Metabolic studies were performed on 3 members. In vivo tests suggested that the remaining fat tissue responded normally to stimulators and inhibitors of lipolysis. In vitro incubation of the dystrophic fat tissue of one patient suggested that the intracellular pathways of lipid and glucose metabolism were normal. The pattern of subcutaneous loss of adipose tissue observed in this family may be due to sympathetic nervous system overactivity of certain non-contiguous dermatomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01222107
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The epithelium of turbellaria (1912)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 23 (1912), S. 255-268 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050230204
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  • 7
    Electronic Resource
    Electronic Resource
    A note on mitochondria (1928)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 40 (1928), S. 351-363 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1090400306
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    Paper (German National Licenses)
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