Abstract
This chapter discusses the phenomenon of photoinduced surface deposition (PSD) of silver (Ag). Photodoping (or photodissolution) of metallic Ag into chalcogenide glasses is the most well-known photoinduced phenomenon accompanied by the long-range movement of Ag+ ions. Photodoping is observed for samples in which the chalcogenide glass is in contact with an Ag film. The size and number of the Ag deposits depend significantly on the composition of the sample (Ag content), photon energy, intensity of illumination, illumination time, sample temperature, surface condition of sample, and atmosphere. With respect to the formation of Ag particles by illumination, the PSD phenomenon resembles the photochemical reaction in conventional photographic films. In the case of photographic films, the formation of Ag particles on AgBr(Cl) crystals is induced by photoexcited electrons trapped at the crystal surface. Arsenic (As)-based glasses are suitable for the study of the basic properties and mechanism of the PSD phenomenon because of the large Ag deposits on them; however, bulk samples are not suitable for optical recording devices. The mechanism of Ag migration in the PSD process can be explained by the diffusion of photoexcited holes, as for Ag photodoping and photoinduced chemical modification (PCM) phenomena.
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