Optical absorption and electrical conduction in polyethylene

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Abstract
The dependence of the optical absorption of polyethylene on photon energy is analyzed and correlated with electrical conduction. The optical gap is obtained as 7.35 eV, with a band tail of about 1 eV. Electrons transport by hopping according to μ0 exp(−Eμ/kT), where μ0 = 5 cm2/V sec and Eμ = 0.24 eV at 20–80°C. Electrons are supplied from deep donors which lie at 2 eV and more below the conduction band. The deep donors are considered to be responsible for the increase in the conductivity at high field, which might be explained by the Poole-Frenkel effect.

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