High-performance optoelectronic and thermoelectric properties of transparent conductors based on Tl 2 O 3 under pressure.

Autor: Rahnamaye Aliabad HA; Department of Physics, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran. Rahnama@hsu.ac.ir., Asadpour Arzefooni A; Department of Physics, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran., Sadati SZ; Department of Physics, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran., Özdemir EG; Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06560, Ankara, Turkey., Khosrojerdi P; Department of Physics, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Apr 22; Vol. 14 (1), pp. 9237. Date of Electronic Publication: 2024 Apr 22.
DOI: 10.1038/s41598-024-58657-9
Abstrakt: In this work, the full-potential linearized augmented plane wave method (FP- LAPW) and the modified Becke-Johnson (mBJ) functional with spin-orbit (SO) coupling are used the obtain the structural, optoelectronic and thermoelectric properties of Tl 2 O 3 under pressure. The results show that Tl 2 O 3 , as transparent conducting oxide (TCO), is a direct bandgap semiconductor with a band gap of 1.23 eV. The band gap value and the effective mass of electrons increases by increasing pressure. Density of state spectra reveal that the nature of electrons in Tl-6s state in the bottom of conduction band, like free electrons in s state, is responsible for the conducting behavior of Tl 2 O 3 . A blue shift is observed in optical spectra such as electron energy loss and absorption spectra with an increase in pressure. Obtained dielectric constants under pressure are inversely proportional to the band gap value according to Penn model. The effects of pressure on thermometric properties are also explored. The hydrostatic pressure increases Seebeck coefficient, while it decreases thermal conductivity that is an effective way to the enhancement of the thermoelectric efficiency of TCOs. A figure of merit (ZT) of 0.98 in p-type Tl 2 O 3 is achieved that is desirable for using in thermoelectric devices.
(© 2024. The Author(s).)
Databáze: MEDLINE
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