Development of new chalcogenides based on alkali metals in the field of optoelectronic devices


The burgeoning field of optoelectronic devices is responsible for the development of new alkali metal chalcogenides consisting of grades that need careful consideration.

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The need for efficient optoelectronic devices is increasing and goes hand in hand with the difficulty of finding new semiconductors with useful properties. This has encouraged considerable research in the synthesis and characterization of new alkali metal (AM) chalcogenides including silver, copper and alkali metal with useful properties like semi-conductivity, flexibility, high thermal stability and photovoltaic effects.

Inspired by the growing demand for new optimal semiconductor materials, a new study published in EPJ B written by Abdelmadjid Bouhemadou, Laboratory for the Development of New Materials and their Characterizations, Department of Physics, Faculty of Sciences, University of Ferhat Abbas Sétif, Algeria and his co-authors, examined the elastic, structural, optical and electronic properties of two newly synthesized compounds, called Tl2CdGeSe4 and T12CdSnSe4.

In the completed study, the authors explain concerns about AM-based chalcogenides that hinder technological applications. The authors add that these drawbacks could be overcome by compounds that combine thallium (Tl), such as Tl2CdGeSe4 and T12CdSnSe4.

Tl is much less electropositive compared to the alkali metals, the scientists describe. The electronegativity of Tl appears to be far greater than that of any alkali metal. This results in a less ionic character in Tl-based compounds, which could lead to low electrical resistivities and hence higher carrier mobilities.

In addition, Tl is bulkier than any stable alkali metal, implying that it has low lattice thermal conductivity improving physical properties that require low lattice thermal conductivity such as thermoelectric efficiency.

Additionally, Tl-containing materials are likely to be less sensitive to moisture and air than AM-based compounds. These and other benefits imply that considerable research has gone into the study of Tl-based chalcogenides.

The study authors say their study found that the materials studied tend to show high absorption in an energy window consisting of the visible spectrum. In addition to this, the improved structural parameters of Tl2CdGeSe4 and T12CdSnSe4 are in better agreement with the experimental counterparts.

This verifies the reliability of the theoretical method used to predict the physical properties of the title compounds.

This revealed that the studied compounds are ductile, soft, mechanically stable and significantly, structurally and elastically anisotropic materials.

Journal reference:

Bhoyar, PD, et al. (2022) Robustness of directed percolation under relaxation of prerequisites: role of extinct disorder and memory. The European physical journal B.



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