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Features of photoelectric characteristics of CdS:Fe samples obtained using various techniques
Russian version
Kharitonova P.G. 1, Stetsyura S.V. 1
1Saratov State University, Saratov, Russia
Email: haritonovapg@gmail.com, stetsyurasv@mail.ru
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In this paper, we investigate heterophase CdS:Fe film samples obtained by thermal evaporation in vacuum and by a hybrid technique using the Langmuir-Blodgett technology. We conducted a comparative analysis of the photoelectric characteristics of the obtained samples, which showed significant differences in the nature of the change in dark currents and photocurrents when using the specified methods for obtaining samples. The observed differences in the values of the dark current and photocurrent, photosensitivity and photocurrent changes over time are explained by the different arrangement of the layers that are the source of Fe during diffusion, and, as a result, the different arrangement of the heterophase region with nanoscale FeS inclusions relative to the illuminated surface of the sample. As a result of diffusion and precipitation processes in the first case (Langmuir-Blodgett technology), the largest nanoscale FeS precipitates are formed near the illuminated surface, and in the second case (thermal evaporation in vacuum), they are formed near the substrate. The advantages of a hybrid method of obtained CdS:Fe for synthesis a material with an extended range of properties and high photosensitivity have been revealed. Keywords: iron-doped cadmium sulfide, photoelectric characteristics, thermal evaporation in vacuum, Langmuir-Blodgett layers.
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