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Polyimides pp 487–505Cite as

The Photoinduced Polarization and Autophotoelectret State in Polypyromellitimide Film

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Abstract

The photoelectret state in Kapton® polypyro-mellitimide has been investigated as a function of polarizing temperature (30° to 250°C), field 85–214 kV/cm), time (5–25 minutes) and illumination intensity (5000 lux). The optimum values of polarizing temperature and field were obtained for photo-electret charge. With the help of these optimized parameters, the effect of intensity of illumination on photo-polarization was studied using visible light and ultraviolet radiations. Experiments were conducted with heat-treated as well as as-received Kapton samples. An increase in photo-electret charge with polarizing field and temperature followed by a saturation has been observed which is a characteristic property of photoelectrets. Increase in polarizing temperature results in an increase in photo-polarization but at high temperatures(above 200°C) the photoelectret charge starts decreasing; this may be due to an increase in thermal recombination of the charges. The photoelectret charge is observed to increase with the intensity of illumination followed by a saturation which is in accordance with the reciprocity law. Ultraviolet radiation of 254 nm wavelength was found to be more efficient for photo-polarization than visible light. Heat treatment causes a reduction in photoelectret charge which may be due to the decrease in the number of traps due to high temperature aging. The nature of dark depolarization characteristics shows the presence of shallow and deep trap levels in Kapton. Tie total volume trap density was estimated to be 3 x 10 traps/cm. The autophotoelectret state, i.e., obtaining of polarization by illumination alone (without applying any electric field) has also been investigated in Kapton. The photoelectromotive force is seen to increase with temperature as well as with illumination intensity. The conducting glass-Kapton-Aluminum combination gives a photoelectromotive force of 1.15 volts at a temperature of 200°C.

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Author information

Authors and Affiliations

  1. Department of Applied Physics, Regional Engineering College, Kurukshetra, 132119, India

    B. L. Sharma & J. K. Quamara

  2. Department of Physics, Indian Institute of Technology, Hauz-Khas, New Delhi, 110016, India

    P. K. C. Pillai

Authors
  1. B. L. Sharma
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  2. J. K. Quamara
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  3. P. K. C. Pillai
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Editor information

Editors and Affiliations

  1. Hopewell Junction, IBM Corporation, New York, 12533, USA

    K. L. Mittal

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© 1984 Springer Science+Business Media New York

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Sharma, B.L., Quamara, J.K., Pillai, P.K.C. (1984). The Photoinduced Polarization and Autophotoelectret State in Polypyromellitimide Film. In: Mittal, K.L. (eds) Polyimides. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7637-2_33

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  • DOI: https://doi.org/10.1007/978-1-4615-7637-2_33

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-7639-6

  • Online ISBN: 978-1-4615-7637-2

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