Temperature Dependence of Photoconduction in Polyethylene Induced by Vacuum-Ultraviolet Light

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Abstract
Intrinsic photoconduction in polyethylene (PE) and its dependence on temperature have been investigated in the photon energy range between 7 eV and 11.5 eV. The band gap of PE is evaluated from the photoconduction spectra. The rise time of the photocurrent increases exponentially with the reciprocal of the temperature, corresponding to a decrease in the carrier mobilities at lower temperatures. In low-density PE, the steady photocurrent increases greatly with temperature in the room-temperature region but saturates at 40°–50°C, tending to decrease slightly at higher temperatures, regardless of the applied field and the light intensity. Photoconduction in high-density PE has very different features compared with that in low-density PE. The temperature and crystallinity dependences seem to suggest the migration of ionic spieces in low-density PE.

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