Hydrothermal synthesis of ternary compounds for solar cells

Taking into account that in the Nakhchivan Autonomous Republic of Azerbaijan in summer the energy of the sun's rays reaches 2140 W / per square meter, we conducted experiments to obtain ternary compounds by the method of hydrothermal synthesis. Laboratory studies of the obtained ternary compounds have shown that TlAsS2 and Tl3AsS3 are suitable for the manufacture of solar cells.

Ternary compounds (nanoparticles) of TlAsS2 and Tl3AsS3 have been synthesized under hydrothermal conditions in ethylene glycol medium at the temperature of 413-443 K during 5 hours from thallium acetate, sodium metaarse-nite and thioacetamide as sulfurizing reagent. The thermogravimetric, differential thermal analysis (DTA), electron microprobe and chemical analysis have been carried out. The results showed that the composition of thallium thio- compounds corresponding to the formula TlAsS2 and Tl3AsS3. The results of SEM analysis showed that the obtained TlAsS2 nanoparticles are irregularly shaped. The Tl3AsS3 nanoparticles form nano-crystalline flowers, and their di-mensions vary within the limit of 96.6-213 nm. It is ascertained by X-ray diffraction (XRD) that the parameters of the unit cell a = 12.29Å, b = 11.33Å, c = 6.11Å, β = 104.40, Z = 8 and s. gr. P21/a for the TlAsS2 compound and the pa-rameters of Tl3AsS3 compound a = 12.324Å, c = 9.647Å, Z = 7, s.gr. R3m.

The compound Tl3AsS3 can be applied in the conversion of solar energy into electricity. The use of photocells from Tl3AsS3 compounds during the receipt of electricity is the most effective method.

When using TlAsS2 and Tl3AsS3 compounds on solar converters, which have the property of absorbing the visible part of the solar spectrum well and practically do not emit in the infrared region of the spectrum, significantly in-creases the efficiency of solar converters.

1. Singh, N.B. Growth Mechanism and Characteristics of Semiconductor Nanowires for Photonic Devices / N.B. Singh [and other] // Journal of Nanoscience and Technology (JNT). – 2014. – Vol.1 (2). – P. 1-8.

2. King, M. Nanowire-based photodetectors: growth and development of chalcogenide nanostructured detectors, Micro- and Nanotechnology Sensors, Systems, and Applications III, edited by Thomas George, M. Saif Is-lam, Achyut K. Dutta / M. King [and other] // Proc. of SPIE. – 2011. – Vol. 8031. – P. 803132 (1-8).

3. Johansson, J. Mass transport model for semiconductor nanowire growth / J. Johansson [and other] // J. Phys. Chem. B 109. – 2005. – Vol. 28. – P. 13567-13571.

4. Schmidt, V. Diameter dependence of the growth velocity of silicon nanowires synthesized via the vapor-liquid-solid mechanism / V. Schmidt [and other] // Phys. Rev. B 75. – 2007. – P. 045335(1-6).

5. Popesku, M.A. Non-crystalline Chalcogenides / M.A. Popesku. – Niderland: Kluwer Acad.Publ., 2008. – 388 p.

6. Petkov, K. Effect of thallium on the optical properties and structure in thin As-S-Tl films / K. Petkov [and other] // J. Optoelectronics and Advanced Materials. – 2005. – Vol. 7. – R. 2587-2594.

7. Bercha, D.M. The complicated chalcogenides and chalcohalogenides / D.M. Bercha [and other] // Kiev: Vysha Shkola, Lvov. – 1983. – P. 181 (In Russian).

8. Radtke, A.S. Occurrence of lorandite TlAsS2 at the Carlin gold dedosit, Nevada / A.S. Radtke [and other] // Econ. Geol. – 1974. – Vol. 69. – R. 121-174.

9. Balik-Zunik, T. Contribution of the crystal chemistry of tallium sulfosalt III. The crysral structure of lorandite (TlAsS2) and its relation to weissbergite (TlSbS2) / T. Balik-Zunik [and other] // Journal of Mineralogy and Geochemistry. – 1995. – Vol. 168. – R 213-235.