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Soutenance de thèse

Vendredi 9 décembre à 10h00
Salle Remy Lemaire, K223

Oratrice : Meriam Ben-Khedim
"Study of electrodeposited nanowires of Bi2-xSbxTe3 and Bi2Te3-xSex and their integration into thermometric modules"

Abstract

This work is a collaboration between STMicroelectronics Rousset and Néel Institute Grenoble. The purpose is to explore the potential of thermoelectric nanowires materials 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. In the other hand, low dimensional materials are interesting due to the possibility of ZT enhancement 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 inti nonporous alumina templates. Structural and thermoelectric properties have been characterized. To characterize electrical transport properties, a new method has been developed based on direct measurement on single nanowire embedded on the growth matrix. N-type nanowires exhibits low resistivity of about 0.3 mΩ.cm² which is lower than bulk materials and calculated ZT reached 0.11. The second part of this work concerned the optimization of contact resistance and assembly of n and p-type nanowires using rigid and flexible substrates. Results confirm the possibility of development of thermoelectric modules based on nanowires in their membranes. Maximal power is estimated to reach 56.5 µW.

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