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  • 1
    Electronic Resource
    Electronic Resource
    Thermoacoustic analysis of solar cells by current modulation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4685-4690 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoacoustic effect and a similar thermoacoustic effect with an alternating current (electroacoustic effect) are used to investigate the spatial distribution of heat sources in crystalline silicon solar cells. The use of a reference signal produced inside the same sample to normalize the acoustic signal allows background and photoacoustic cell effects to be reduced. The frequency dependence of these normalized measurements can be calculated analytically. Covering frequencies up to 10 kHz, the electroacoustic effect allows the nondestructive determination of diffusion lengths and recombination velocities at the interfaces. Volume and surface effects can thus be separated, which is useful for the analysis of high-efficiency solar cells. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363452
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reflectivity measurements in the vacuum ultraviolet wavelength range on technical surfaces for the Wolter I telescope on board the X-ray astronomy satellite ROSAT (1986)
    Springer
    Astrophysics and space science 125 (1986), S. 169-174 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of reflectivity measurements in the vacuum ultraviolet wavelength region (VUV) on technical surfaces are described which are used in the Wolter I-telescope on board the German X-ray astronomy satellite ROSAT. The materials investigated are the special iron-nickel alloy Invar and a carbon fibre compound (CFK). The centre connecting flange for the parabolic and hyperbolic mirror sections of the telescope is made of Invar. CFK is used for the thermal baffle in front of the telescope. It had to be checked whether the structure of the centre flange and the thermal baffle sufficiently suppress scattered ultraviolet radiation in order to avoid a substantial background level in the detectors which are located in the focal plane of the telescope. The detectors consist of two positional sensitive proportional counters (PSPC) with a spatial resolution of 0.5 arc min and an image converter with a resolution of a few arc sec. The detectors are mounted on a carrousel platform and are intended to be positioned alternatively in the focal plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643981
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    Paper (German National Licenses)
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