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Etude de nanofils électrodéposés de Bi2-xSbxTe3 et Bi2Te3-xSex et de leur intégration dans des modules thermoélectriques

Abstract : This work is a collaboration between STMicroelectronics-Rousset and Néel Institute. The purpose is to explore the potential of thermoelectric nanowires based on (Bi, Sb, Te, Se) to convert heat to electricity at ambient temperature. The final aim is to develop miniaturised and autonomous sources to power the connected devices. On the other hand, low dimensional materials are interesting due to the possibility of ZT enhancement by thermal conductivity reduction and their easy integration into microdevices. In this context, thermoelectric nanowires of (Bi2Te3-xSex) for n-type and (BixSb2-xTe3) for p-type have been electrodeposited into nanoporous alumina templates. Structural and thermoelectric properties have been characterized. To characterize electrical transport properties, a new method has been developed based on direct measurement by nanoprobing on single nanowire embedded on the growth matrix. Thermal conductivity was also investigated using the 3 method. N-type nanowires exhibits low resistivity of about 0,3 mΩ.cm² which is lower than bulk materials and calculated ZT reached 0,12. The second part of this work concerned the optimization of contact resistance (thermoelectric / metal) and assembly of n and p-type nanowires arrays on rigid and flexible substrates. Results confirm the possibility of development of thermoelectric modules based on nanowires in their membranes. The maximum generated power is estimated to reach 56,5 μW using only three legs.
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https://tel.archives-ouvertes.fr/tel-01556570
Contributor : Meriam Ben Khedim <>
Submitted on : Wednesday, July 5, 2017 - 11:51:17 AM
Last modification on : Thursday, November 19, 2020 - 1:01:55 PM
Long-term archiving on: : Tuesday, January 23, 2018 - 8:18:50 PM

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  • HAL Id : tel-01556570, version 1

Citation

Meriam Ben Khedim. Etude de nanofils électrodéposés de Bi2-xSbxTe3 et Bi2Te3-xSex et de leur intégration dans des modules thermoélectriques. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2016. Français. ⟨tel-01556570v1⟩

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