Enhancing Thermoelectric and Mechanical Properties of p-Type (Bi,Sb)<sub>2</sub>Te<sub>3</sub> through Rickardite Mineral (Cu<sub>2.9</Enhancing Thermoelectric and Mechanical Properties of p-Type (Bi, Sb)2Te3 through Rickardite Mineral (Cu2.9Te2) Incorporation>Te<sub>2</sub>) Incorporation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry of Materials Année : 2023

Enhancing Thermoelectric and Mechanical Properties of p-Type (Bi,Sb)2Te3 through Rickardite Mineral (Cu2.9Te2) Incorporation

Kivanc Saglik
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Mujde Yahyaoglu
Christophe Candolfi
Umut Aydemir
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Résumé

Bi2Te3-based alloys are widely utilized in Peltier coolers owing to their highest thermoelectric performance at nearroom-temperatures. However, their peak dimensionless thermoelectric figure of merit, zT, is limited to a narrow temperature window due to minority carrier excitation emerging upon heating at around 400 K. Here, we show how this issue can be overcome by incorporating a synthetic rickardite mineral, Cu3−xTe2, in p-type (Bi,Sb)2Te3. The significant enhancement of the electronic and thermal properties could be achieved due to small Cu incorporation into the crystal structure of Bi,Sb)2Te3 and homogeneous precipitation of Cu3−xTe2 at the grain boundaries. This leads to a high average zT value (zT ave) of 1.22 between 350 and 500 K for two compositions, Bi0.5Sb1.5Te3 (BST-5) and Bi0.3Sb1.7Te3 (BST-3), with peak zT values of 1.32 at 467 K and 1.30 at 400 K, respectively. These high zT values result in a considerably high maximum device ZT of ca. 1.15 and a theoretical efficiency of up to 7% between 325 and 525 K. Additionally, room-temperature micro-hardness is substantially improved, which is desirable for constructing reliable and durable thermoelectric modules.
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hal-04093868 , version 1 (10-05-2023)

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Kivanc Saglik, Mujde Yahyaoglu, Christophe Candolfi, Umut Aydemir. Enhancing Thermoelectric and Mechanical Properties of p-Type (Bi,Sb)2Te3 through Rickardite Mineral (Cu2.9Te2) Incorporation. Chemistry of Materials, 2023, 35 (9), pp.3603-3613. ⟨10.1021/acs.chemmater.3c00229⟩. ⟨hal-04093868⟩
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