Investigating newly synthesized thallium compounds for optoelectronic
devices

Date:
April 5, 2022
Source:
Springer
Summary:
The burgeoning field of optoelectronic devices is driving the
development of new alkali metal-based chalcogenides with qualities
that have to be robustly investigated.



FULL STORY ==========================================================================
The burgeoning field of optoelectronic devices is driving the development
of new alkali metal-based chalcogenides with qualities that have to be
robustly investigated.


==========================================================================
The need for efficient optoelectronic devices is growing and hand-in-hand
so too is the challenge of discovering new semiconductors with valuable properties. This has spurred significant research in the synthesis and characterization of new alkali metal-based (AM) chalcogenides involving
copper, silver and alkali metal with valuable properties like flexibility,
high thermal stability, semiconductivity, photovoltaic effects.

Inspired by the growing demand for new optimum semiconducting materials, a
new paper published in EPJ Bauthored by Abdelmadjid Bouhemadou, Laboratory
for Developing New Materials and their Characterizations, Department of Physics, Faculty of Science, University of Ferhat Abbas Setif, Algeria
and his co- authors, investigated in detail the structural, elastic,
electronic and optical properties of two newly synthesized compounds,
namely Tl2CdGeSe4 and Tl2CdSnSe4.

In the paper, the authors describe concerns with AM-based chalcogenides
which hinder technological applications, adding that these disadvantages
could be overcome by compounds that integrate thallium (Tl) including Tl2CdGeSe4 and Tl2CdSnSe4.

The researchers explain that Tl is much less electropositive than alkali metals; the electronegativity of Tl is much higher than that of any
alkali metal. This leads to a less ionic character in Tl-based compounds,
which may lead to low electrical resistivities and therefore to higher
carrier mobilities.

Tl is also heavier than any stable alkali metal, which means it
has low lattice thermal conductivity improving physical properties
requiring low lattice thermal conductivity such as thermoelectric
efficiency. Tl-containing materials also tend to be less sensitive to
air and moisture than AM-based compounds.

These and other advantages mean that significant research has been devoted
to the exploration of Tl-based chalcogenides The authors of the paper
say that their research revealed that the studied materials exhibit a
high absorption in an energy window involving the visible spectrum. In
addition to this, the optimized structural parameters of Tl2CdGeSe4 and Tl2CdSnSe4 are in excellent agreement with the experimental counterparts, confirming the reliability of the theoretical method used to predict
the physical properties of the title compounds.

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


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for style and length.


========================================================================== Journal Reference:
1. S. Karkour, A. Bouhemadou, D. Allali, K. Haddadi, S. Bin-Omran, R.

Khenata, Y. Al-Douri, A. Ferhat Hamida, A. Hadi, A. F. Abd El-Rehim.

Structural, elastic, electronic and optical properties of the
newly synthesized selenides Tl2CdXSe4 (X = Ge,
Sn). The European Physical Journal B, 2022; 95 (3) DOI:
10.1140/epjb/s10051-022-00288-y ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/04/220405115236.htm

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