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arXiv · 2608.03638

Epitaxial SiGeSn alloys for CMOS-compatible thermoelectric devices

Patrizio Graziosi·Damiano Marian·Andrea Tomadin·Stefano Roddaro·Omar Concepción·Johnny Tiscareño-Ramírez·Agnieszka Anna Corley-Wiciak·Dan Buca·Giovanni Capellini·Michele Virgilio
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Abstract

The integration of thermoelectric devices into mainstream microelectronic technological platform could be a major breakthrough in various fields within the \emph{so-called} Green-IT realm. In this article, the thermoelectric properties of heteroepitaxial SiGeSn alloys, a novel CMOS compatible material system, are evaluated to assess their possible application in thermoelectric devices. To this purpose, starting from the experimentally low lattice thermal conductivity of SiGeSn/Ge/Si layers of about $\sim$1-2 W/m$\cdot$K assessed by means of 3-$\omega$ measurements, the figure of merits are calculated through the use of Boltzmann transport equation, taking into account the relevant inter-valley scattering processes, peculiar of this multi-valley material system. Values for the figure of merit $ZT$ exceeding $1$ have been obtained for both p- and n- type material at operating temperatures within the 300---400 K range, i.e. at a typical On-Chip temperatures. In this interval, the predicted power factor also features very competitive values of the order of 20 $\rm{\mu W/cm\cdot K^2}$. Our finding indicates that this new class of Si-based materials has extremely good prospects for real-world applications, and can further stimulate scientific investigation in this ambit.

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BibTeXRIS

Patrizio Graziosi, Damiano Marian, Andrea Tomadin, Stefano Roddaro, Omar Concepción, Johnny Tiscareño-Ramírez, Agnieszka Anna Corley-Wiciak, Dan Buca, Giovanni Capellini, Michele Virgilio. 2026-08-04. Epitaxial SiGeSn alloys for CMOS-compatible thermoelectric devices. https://doi.org/10.1021/acsaem.5c00733

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