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  • 72.60  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet-laser-induced permanent electrical conductivity in polyimide (1993)
    Springer
    Applied physics 56 (1993), S. 275-281 
    Details
    ISSN: 1432-0630
    Keywords: 72.20 ; 72.60 ; 81.60.Jw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract When polyimide (Kapton) is irradiated by a krypton fluoride (KrF) laser, an increase of the electrical conductivity of up to 16 orders of magnitude is observed. In the high conduction regime, the resistivity is about 0.1 Ω cm, the current voltage characteristic is ohmic and the contacts of gold and silver with the irradiated conducting polymer are also ohmic. The conduction mechanism is phonon-assisted variable range hopping, evident from the observed temperature and electric field dependence of the resistivity at low conductivities. The laser-induced conductivity depends on the ambient atmosphere during irradiation. Transmission spectroscopy in the visible region and infrared Fourier transform spectroscopy have been used to characterize the material. A thermal mechanism is proposed for the formation of conducting polyimide, by excimer-laser irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539487
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal and mechanical coupling between successive pulses in KrF-excimer-laser ablation of polyimide (1996)
    Springer
    Applied physics 62 (1996), S. 203-211 
    Details
    ISSN: 1432-0630
    Keywords: 81.40 ; 81.60 ; 72.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Multiple-shot effects in laser processing and ablation of polyimide are examined and are found to be the dominant phenomena for processes involving several hundreds or thousands of pulses. For fluences less than 260 mJ/cm2, it was found that it is impossible to cut through 75 μm polyimide foils for an arbitrarily large number of excimer pulses even though this fluence is more than ten times the single-shot ablation threshold. The halt in etching is due to the formation, over a number of shots, of a robust carbon matrix with a deep surface roughness which is also responsible for laser-induced electrical conductivity. The effect of thermal coupling between successive shots is shown to be a dominant factor in determining the electrical properties of the carbon layer. Differences in electrical conductivity of up to 12 orders of magnitude were found for only small differences in repetition rate. Transmission electron microscopy revealed the changes in microstructure responsible for the dramatic differences in electrical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575082
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    Paper (German National Licenses)
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