Enhanced Thermoelectric Performance and Mechanical Property in Layered Chalcostibite CuSb<sub>1–<i>x</i></sub>Pb<sub><i>x</i></sub>Se<sub>2</sub> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Applied Energy Materials Année : 2023

Enhanced Thermoelectric Performance and Mechanical Property in Layered Chalcostibite CuSb1–xPbxSe2

Manojkumar Moorthy
Rajasekar Parasuraman
Suresh Perumal

Résumé

In this work, the thermoelectric properties of p-type layered chalcostibite CuSb1–xPbxSe2 (x = 0–0.10) compounds prepared by vacuum melting reaction and uniaxial hot press, have been studied in the temperature range of 323–623 K. Further, aliovalent Pb2+ doping at Sb3+ site in CuSbSe2 notably increases the hole concentration due to its acceptor nature and thereby enhances the electrical conductivity, σ. Importantly, a huge reduction in total thermal conductivity, κtotal has been noticed, from ∼1.7 W/mK (pristine CuSbSe2) to ∼0.72 W/mK at 323 K for CuSb0.90Pb0.10Se2 owing to increased phonon scattering from the introduced point defects and mass-difference between Pb and Sb. As a result, the thermoelectric figure of merit, zT, has been enhanced to ∼0.27 at 623 K for the composition of CuSb0.90Pb0.10Se2, which is 3-fold higher than that of the undoped CuSbSe2. Further, the hardness value achieved was ∼125.54 Hv, which is significantly higher than the most of the state-of-the-art materials, indicating it to be an efficient thermoelectric material for intermediate temperature.

Domaines

Matériaux
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Dates et versions

hal-04188330 , version 1 (28-08-2023)

Identifiants

Citer

Manojkumar Moorthy, Bhuvanesh Srinivasan, David Berthebaud, Rajasekar Parasuraman, Suresh Perumal. Enhanced Thermoelectric Performance and Mechanical Property in Layered Chalcostibite CuSb1–xPbxSe2. ACS Applied Energy Materials, 2023, 6 (2), pp.723 - 733. ⟨10.1021/acsaem.2c02888⟩. ⟨hal-04188330⟩
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