Synthesis of cadmium sulfide by means of electrochemical method
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DEMIDENKO, I., ISHIMOV, Victor. Synthesis of cadmium sulfide by means of electrochemical method. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 230.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Synthesis of cadmium sulfide by means of electrochemical method


Pag. 230-230

Demidenko I., Ishimov Victor
 
T.G. Shevchenko State University of Pridnestrovie, Tiraspol
 
Disponibil în IBN: 11 martie 2019


Rezumat

Wide applications of AIIВVI semiconductor materials in microelectronics, in particular, as a photovoltaic converter of solar energy requires the development of methods for obtaining a large number of thin layers with a wide variety of electro-optical, photoelectric properties. Currently, for obtaining thin layers of the compounds AIIВVI various methods including chemical and electrochemical deposition from aqueous solutions have attracted the attention of many researchers [1,2]. Despite the presence of a large number of publications dealing to technologies producing layers development and optimization of manufacturing technology materials AIIВVI remains relevant. Cadmium sulfide as a compound semiconductor possessing fluorescent properties attracted increasing interest from the point of view of its practical application. Today this compound is regarded as a component in low-cost solar converters, CdS nanoscale powders have found they use as biological markers in cytological studies, research work on the catalytic properties of the powders of the given compound is conducted. The aim of this work is developing the technology of electrochemical synthesis of thin films of cadmium sulfide on the surface of a glass substratum precoated with a layer of SnO2 as well as fine powders of the compound. Synthesis is carried out at relatively low temperatures (70-90 °C), it does not require expensive vacuum equipment and is simple to perform. The duration of one cycle of film widening is limited by a short period of time (within 10 min. depending on the desired film thickness.). For power supply to the electrolytic bath rectangular impulse generator controlled by PC is used. Empirically it was found that the optimal pulse frequency for the conditions of deposition is 1 kHz. The selection of pH of the electrolyte is also critical, it should be maintained in the range pH = 2, the deviation in the alkaline pH region excludes the possibility of formation of CdS film on the cathode surface. The given technology allows us to vary the thickness of the deposited film, by repetition of the deposition process and the selection of an appropriate duration of deposition. The film obtained by this method has good adhesive properties. During the study of the transmission spectra in the annealed samples produced in this manner blue shift effect was observed. Based on this effect the grain size calculated in polycrystalline films was about 6-7nm. We investigated the luminescence properties of CdS powders deposited during synthesis. Photoluminescence maximum intensity of the majority of samples is in the range of λmax = 655-715nm. Taking this fact into consideration we have all cause to believe that luminescence has the admixture character.