Semiconductor cluster

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Fig. 5. Photophysical and photochemical processes in a semiconductor cluster whereand represent chemical species, adsorbed on the surface of the semiconductor particle, which are capable of undergoing reduction and oxidation at rates and respectively. The subscript...

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The radiation-induced method, in the y- or pulse regime [19,20] and, to a certain extent, the photo-induced method [21], provide a particularly powerful means to produce in condensed media, metal, and semiconductor clusters from monomers as precursors, to study their properties and to understand the exotic phenomena which occur whenever a new phase of oligomeric particles is formed in the bulk of a homogeneous mother phase [22-26], phenomena which are therefore rather frequent in physics and chemistry. Unlike a recent review concerning semiconductor clusters [19], the present chapter is specifically focused on metal clusters, induced by ionizing radiation or ultraviolet (UV)-visible photons. 

Some low-valency cations produced in early steps and at partial reduction are immediately neutralized by the counter anion if the solubility product is quite low, and they behave indeed as transient monomers able to coalesce into semiconductor clusters [19]. 

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