ポリーN－ビニルカルバゾールの光電流の色素増感

概要

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The photocurrent of dye-sensitized poly-N-vinylcarbazole (PNVC) films was measured in the wavelength range between 360 and 800 mμ. The dyes used were a triaryl carbonium salt, a benzopyrylium salt, and crystal violet. These deys were found to enhance the photo-carriers (holes) in the films both at the first excitation band of PNVC and at the excitation band of the dyes. From this fact, it is concluded that holes are generated by two processes; the first process is that electrons in the valence band of PNVC transfer to photo-excited dyes ahd the second is that photo-excited electrons in PNVC transfer to dyes.The triaryl carbonium salt which has OCH3 radicals in place of N(CH3)2 radicals in crystal violet was found to show remarkably higher sensitization effect than crystal violet. This is conjectured as follows; the OCH3 radicals lower the energy of π-electorons and hence, make the dye more acceptor-like.The decay time of surface voltage was observed to be about 3 seconds at 3 μW/cm2 illumination on the surface, where the decay time was defined as a time of the surface voltage dropping to a half to its initial value and the spectrum of the light was matched to the absorption of the dye.
The Imaging Society of Japanの論文