Sulfur Sensitization of Large Crystals of AgCl Doped with Sulfur in the Melt

Abstract

A brief review of the studies performed in the author's laboratory on the sulfur sensitization is given. The studies are now in progress and the results up to date are also introduced with some speculations. The sensitization is mainly studied with large crystals of AgCl pulled up from the melt doped with sulfide. Then the purpose of the studies mainly aims to explain the physical properties of the doped crystals in terms of the structure of sulfur centers in AgCl which undergoes many complex transformations during the photographic processes.
A hypothetical mechanism of the sulfur sensitization in large crystals of AgCl is also given, where the silver sulfide is introduced in several forms in the crystal depending on the different conditions of the treatment, and S^2--interstitial silver ion compexes are considered hole traps and S^2--halogen ion vacancy complexes electron traps in order to explain the successive experimental results so far obtained.