Time‐dependent photocurrents in polyethylene

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Abstract
A detailed study of the photocurrents in low‐density polyethylene at wavelengths of 350 nm, 300 nm, and 240 nm has confirmed that the current is a linear function of intensity and has established that the observed decrease of current depends on the integrated flux of quanta at the metal–polymer interface, and is independent of intensity and pulse repetition rate. Comparison with electron excitation experiments shows that in the present case, optical ionization occurs within a few angstroms of the interface.Connections between the present results and known photodegradation data are explored, but no firm correlation can be obtained either for the initial “fast transient” or for the “slow transient” which occurs only in the shorter wavelength region. Possible models for hole injection are presented.

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