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  • 1990-1994  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of barrier inhomogeneities on noise at Schottky contacts (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1113-1115 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electronic properties of Schottky diodes depend sensitively on spatial inhomogeneities of the metal/semiconductor interface. We find that, contrary to previous theories for low-frequency noise, the electronic properties of Schottky contacts cannot be understood if one neglects spatial fluctuations of the Schottky barrier height. Our systematic investigation of several silicide/silicon diodes yields as an empirical law that excess noise increases drastically when the standard deviation σs of the spatial distribution of Schottky barrier heights exceeds the critical threshold value of 2kT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102584
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Direct observation of a scaling effect on effective minority carrier lifetimes (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4168-4172 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective minority carrier lifetime in semiconductors with recombination inhomogeneities depends on the spatial distribution of recombination sites and not only on their absolute number. We use time-resolved microwave reflection measurements to monitor the carrier recombination in silicon wafers with a periodic metallization pattern on one surface. This contact scheme simulates the distribution of sites of enhanced carrier recombination. The experiments reveal a sensitive dependence of the effective minority carrier lifetime on the interdistance and the size—i.e., the scaling—of the metallization pattern at fixed metallization area ratio. This so-called scaling effect occurs whenever the size and the interdistance of recombination sites are comparable to the minority carrier diffusion length. Our experiments are in good agreement with results from a new analytical three-dimensional simulation which is based on the solution of the electronic transport equations in Fourier space. Our model is applicable to the optimization of the backside ohmic contact pattern for high efficiency solar cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358450
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependence of Schottky barrier heights on silicon (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1315-1319 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the temperature dependence of Schottky barrier heights on silicon. The analysis of a large variety of polycrystalline diodes shows that the temperature coefficient of the barrier height depends on the chemical nature of the metal. This observation is in contradiction with models suggesting Fermi-level pinning at the center of the semiconductor's indirect band gap. From the analysis of epitaxial NiSi2/Si Schottky contacts, we conclude that there is a direct influence of interface crystallography on both the barrier height and its temperature dependence. Finally, we present some new results on the pressure coefficient of barrier heights. Pressure and temperature coefficients of polycrystalline Schottky contacts are correlated similarly to the pressure and temperature coefficients of the band gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353249
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  • 4
    Electronic Resource
    Electronic Resource
    Low-temperature ohmic Au/Sb contacts to n-type Si (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 994-997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Au/Sb films annealed at temperatures as low as 370 °C yield ohmic contacts to n-type Si. The contact formation is based on a liquid-phase epitaxy process of Sb-doped Si from Au solution. Measured contact resistivities range around 3×10−2 Ω cm2 and are at least one order of magnitude higher than what is expected from the solid solubility of Sb in Si. The discrepancy stems from local inhomogeneous etching and epitaxial regrowth of the (100)-oriented Si surface by and from the Au solution. Only a small fraction of the macroscopic contact area is doped by Sb and contributes to current transport across the Au/Si(100) interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356425
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  • 5
    Electronic Resource
    Electronic Resource
    Comment on "Negative capacitance at metal-semiconductor interfaces'' [J. Appl. Phys. 68, 2845 (1990)] (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1087-1088 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, Wu, Yang, and Evans [J. Appl. Phys. 68, 2845 (1990)] ascribed excess negative and positive capacitances at abrupt Schottky diodes to interface charges and a "waterfall'' of electrons "falling off the Schottky barrier cliff.'' This comment points out that such strange admittances are not related to interface charge at the front Schottky contact but to defective back contacts, as previously demonstrated [Phys. Rev. Lett. 60, 53 (1988) and Mater. Res. Soc. Symp. Proc. 91, 433 (1987)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349677
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  • 6
    Electronic Resource
    Electronic Resource
    Barrier inhomogeneities at Schottky contacts (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1522-1533 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a new analytical potential fluctuations model for the interpretation of current/voltage and capacitance/voltage measurements on spatially inhomogeneous Schottky contacts. A new evaluation schema of current and capacitance barriers permits a quantitative analysis of spatially distributed Schottky barriers. In addition, our analysis shows also that the ideality coefficient n of abrupt Schottky contacts reflects the deformation of the barrier distribution under applied bias; a general temperature dependence for the ideality n is predicted. Our model offers a solution for the so-called T0 problem. Not only our own measurements on PtSi/Si diodes, but also previously published ideality data for Schottky diodes on Si, GaAs, and InP agree with our theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347243
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon solar cell of 16.8 μm thickness and 14.7% efficiency (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2998-3000 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Liquid phase epitaxy provides a new impetus for thin film photovoltaics based on silicon; we apply this method for about 20-μm-thick solar cells with high efficiencies. The analysis of internal quantum efficiency measurements reveals that the open circuit voltages around 660 mV arise from an excellent electronic quality of our thin silicon films. Their effective minority carrier diffusion lengths range up to 317 μm, a value that exceeds the thickness of the layers by an order of magnitude. The conversion efficiencies exceed 14% with a record value of 14.7% for a 16.8-μm-thick epitaxial layer without special antireflecting coatings. The high open circuit voltages promise a possible boost of the efficiency toward 20% by applying light trapping schemes to optimize the short circuit current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109169
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  • 8
    Electronic Resource
    Electronic Resource
    Quantum efficiencies exceeding unity due to impact ionization in silicon solar cells (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2405-2407 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absolute measurements demonstrate internal quantum efficiencies in silicon solar cells to exceed unity for photon energies above the first direct band gap and to show distinct spectral features that correspond to specific points in the Brillouin zone. Ultraviolet radiation can generate hot carriers with sufficient energy to cause impact ionization which results in two electron hole pairs per incident photon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110489
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  • 9
    Electronic Resource
    Electronic Resource
    Hans-Joachim Queisser on his 60th birthday (1991)
    Springer
    Applied physics 53 (1991), S. A7 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323426
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  • 10
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    Influence of barrier inhomogeneities on noise at Schottky contacts (1990)
    American Institute of Physics
    Details
    Publication Date: 1990-03-19
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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