Abstract
Abstract The photoconductivity of poly-N-vinylcarbazole in a surface-type cell was measured both in a high vacuum and in the air. Fresh films showed a large photocurrent in the lower π-π* absorption region and a small photocurrent in the visible region. The threshold of the photocurrent was found at about 600 mμ. By heat treatment or by pre-irradiation with UV-light or γ-ray, the photocurrent increased throughout the spectral region and its threshold shifted to a longer wavelength. Both the dark current and the photocurrent in the visible and the near IR regions must be due to the thermal or optical reexcitation of the trapped carriers. The activation energies of the dark current (0.4–1.3 eV) and the photocurrent (0.06–1.0 eV) differ according to the temperature range, the light wavelength, and the film history (whether fresh film or one of various pre-treated films). The activation energies are needed for carrier migration and can be explained by the “trapping conduction mechanism”.
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