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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3076-3079 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We explain how Monte-Carlo simulations may be used to calculate the transfer characteristics of GaAs hot-electron transistors, from which hot-electron spectra may be derived. We present such spectra for a range of doping densities and injection energies for a base width of 500 A(ring). We compare our results with those derived from other theories and suggest an experiment which should indicate their relative validity. Optimum parameters for base width and doping for high-frequency hot-electron transistors are derived and compared with available experimental data.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1842-1849 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte Carlo routine has been used to simulate hot-electron transport across narrow regions of heavily doped In0.53Ga0.47As. The doping level/widths considered correspond to those proposed for the base of hot-electron transistors. For doping levels of order 1018 cm−3, the injected hot electrons suffer inelastic scattering by the coupled plasmon-optic phonon mode. The performance of hot-electron transistors is characterized by the base transfer factor which relates a change in collector current with a change in emitter current. The base transfer factor is determined from the simulations for a range of base widths and operating conditions. Results for InGaAs are compared with those for GaAs. Under comparable operating conditions, the InGaAs hot-electron transistor offers a higher transport efficiency and hence, higher current gain compared with that of GaAs. We have used the Monte Carlo routine to simulate the performance of experimental results from InGaAs hot-electron transistors. The simulations are in good agreement with the experimental results.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1603-1607 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of a study on the relationship between the structural and electronic properties of a graded layer of undoped AlxGa1−xAs, where x was specified to increase linearly from 0 to 0.2 over 50 nm. The layer was grown by molecular-beam epitaxy between layers of doped GaAs. A high-resolution dark-field transmission electron microscopy imaging technique of combining information from 002 and 002¯ reflections of AlxGa1−xAs allowed us to image the graded region with near atomic resolution. Differences between the predicted and measured diode performance of the graded layer are discussed in the light of our results.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1425-1427 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe the results of the incorporation of magnetic field effects into the Monte Carlo simulation of hot electrons traversing narrow regions of heavily doped GaAs. In addition to accounting for the experimentally observed suppression of the ballistic contribution to the hot-electron spectrum, a further analysis allows us to infer the spread in transverse energy of the injected hot electrons.We attribute this loss of collimation to scattering by unscreened ionized impurities in the depletion region which is set up when a hot-electron injector is forward biased.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The problem of coherent flux tunnelling across a Josephson weak link enclosed by a thick superconducting (‘SQUID‘) ring in terms of quantum electrodynamics is considered. We show that for a low effective noise temperature (≃few K) in the SQUID ring and with the weak link ...
    Type of Medium: Electronic Resource
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