Photopolarization and depolarization characteristics of poly(N‐vinyl carbazole)

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Abstract
The photoelectret properties of poly(N‐vinyl carbazole) sandwiched between a conducting glass electrode and an aluminum electrode have been studied. Photoelectret polarization was carried out by simultaneous application of an electric field and ultraviolet illumination. The polarization exhibits a linear dependence on the polarizing voltage, polarization time, and illumination intensity, with saturation effects for large values of these parameters. The depolarization current decay is quite fast, which indicates the absence of deep‐trap levels. The ratio of photoelectret charge to the dark polarization charge is found to be 100, which determines the image contrast if the polymer film is used in persistent internal polarization (PIP) electrophotography.

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