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  • 1
    Electronic Resource
    Electronic Resource
    Copper as an electron trap in GaAs0.6P0.4 (1994)
    Springer
    Applied physics 59 (1994), S. 245-251 
    Details
    ISSN: 1432-0630
    Keywords: 71.00 ; 61.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An electron trap having an energy level of 0.14 eV from the conduction band edge was found in the bulk of copper-diffused VPE-grown n-GaAs0.6P0.4 by conventional DLTS measurements and by pulse-duration dependent capacitance amplitude measurements. The capture cross section at room temperature is about 1.0×10−21 cm2 and has a weak temperature dependence. These properties are attributed to a non-repulsive center having a capturing mechanism which involves multiphonon emission processes with hardly any lattice relaxation. Evolution of the spatial distributions of the traps with time under junction electric field were studied. The results suggest that the trap is positively charged and has a high diffusivity under electric field. The center can thus be identified as positively charged interstitial copper ion rather than some form of copper complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348227
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoacoustic phase spectrum of a layered sample (1995)
    Springer
    Applied physics 60 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: 78.20.Hp ; 82.80.Kq ; 87.50.Hj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Based on the Rosencwaig-Gersho theory (RG), we have studied the PhotoAcoustic Phase Spectrum (PAPS) of a two-layer sample. The theoretical results are mainly verified by an experiment, in which an intact plant leaf is used as the sample. The ratio of the optical absorption coefficient to the thermal diffusion coefficient for the subsurface layer can be obtained from the theoretical formula using measured phase values. The spectrum formed by the ratios at different wavelengths is in a good agreement with those experimentally obtained by phaseresolved photoacoustic spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538344
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    Paper (German National Licenses)
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