Effect of Dyes on the Photoconductivity of Sintered AgBr Microcrystals at Low Temperature and the Role of Silver Ions in the Photographic Action of Dyes

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Photoelectric properties of sintered AgBr microcrystals have been investigated at low temperature. It was shown that the photocurrent was dominated by the electron trapping condition, which seemed to be related to excess surface silver ions, at the surface of the sintered materials and increased by addition of desensitizing dyes except for phenosafranine. This increase of photocurrent was explained by the electron transfer from silver bromide crystals to adsorbed desensitizing dyes. The desensitizing dyes, which increased the contrast in surface sensitivity of a primitive emulsion at room temperature, did not show the Capri-blue effect at liquid nitrogen temperature.<BR>From the fact that there was no simple relation between the lowest vacant levels of the dyes and their electron trapping abilities and that the electron trapping by these dyes did not always imply the formation of the latent image specks at the dye sites. it is deduced that excess silver ions at the surface of AgBr crystals play an important role in the electron trapping and the latent image formation at the site of adsorbed dyes.
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