Influence of FeS nanoinclusions on photoelectric characteristics of CdS:Fe

We modified the surface of single-crystal CdS using an organic coating of iron arachinate obtained by the Langmuir–Blodgett technology, followed by annealing of the resulting hybrid structure. We have demonstrated the possibility of forming a heterophase structure of the diluted magnetic semiconductor CdS-FeS, which has an extended range of properties. We carried out a study of the chemical composition before and after modification of the CdS surface by an organic coating. Variation the number of deposited iron arachinate monolayers made it possible to change the parameters of the limited iron source within the required limits, ensuring the formation of ferromagnetic phase nanoinclusions of size-defined at a target depth. The prediction of the size of the FeS phase and its distribution by depth was carried out by modeling the simultaneous processes of Fe diffusion, formation and precipitation of nanosized inclusions of the magnetic phase. We have determined the optimal number of monolayers in the coating (25–35), which ensures the formation of precipitates larger than 3 nm at a depth of at least 0.21 $\mu$m, and an increase in the photosensitivity of the obtained material by 20–40 times.