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  • 1
    Electronic Resource
    Electronic Resource
    Charge-state effects of deep centres in semiconductors on non-radiative capture of carriers by multiphonon processes (1996)
    Springer
    Applied physics 63 (1996), S. 37-43 
    Details
    ISSN: 1432-0630
    Keywords: 71.55 ; 63.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A set of simplified analytical expressions for carrier capture coefficients, including quantatively the charge-dependent effect, have been obtained for easy physical examination and comparison with experiments. The temperature-related charge-state-dependent factorF(T) thus calculated could be used to present more accurately the nature and magnitude of the charge state of a trap centre. The ranges of values ofF(T) valid for attractive, repulsive and neutral centres are also obtained. In addition, we show that the thermal ionization energy for theB centre in GaAs is a function of temperature. The importance of the data of capture cross-section at low temperatures in determining the charge state and characteristic of a deep centre is also manifested. Both the absolute magnitude and the temperature-dependent behaviour of the calculated capture cross-section are well-supported by the very good fits to the experimental electron cross-sections forA andB centres in GaAs reported by Lang [7] and Wang et al. [22] and for Cu centre in Ge reported by Zhdanova and Kalashnikov [23].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579744
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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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