Members : Agnès Huynh, Mahmoud Eddrief, Paola Atkinson, Serge Vincent, Massimiliano Marangolo, Danièle Fournier
Current concerns for developing high quality thermoelectric materials and components require both an understanding of the physical phenomena and accurate electrical and thermal measurements. A good thermoelectric material must have simultaneously a high Seebeck coefficient, good electrical conductivity (i.e. low electrical resistance) and low thermal conductivity. This project focuses on the measurement of thermal properties of new materials, either in bulk or deposited in thin films on substrates (thin films or superlattices). We have at our laboratory the means to develop nanostructures or thin films with good thermoelectric properties, a thermoreflectance microscope that allows the measurement of thermal conductivity with a micrometric spatial resolution and measurements of the Seebeck coefficient and electrical conductivity (SU’s ‘low temperature’ platform). We work in collaboration with L. Paulatto (IMPMC) and M. Calandra (Università di Trento, Italy).
Légende :Thermal conductivity in thin films of Bi2Se3 as a function of sample thickness at 300 K. Experimental data: lattice thermal conductivity of Bi2Se3 grown on GaAs(001), to be compared with κ out-of-plane axis (dashed line). Blue thick line use our theory of Casimir scattering, while red lines use the method of cutting-off phonons. Calculations by L. Paulatto (IMPMC, SU). L. Paulatto et al. Phys. Rev.B 2020.
Publications
- Straightforward measurement of anisotropic thermal properties of a Bi2Se3 single crystal. J. Phys Condens Matter. 2018 Mar 21;30(11):115701.doi: 10.1088/1361-648X/aaad3c.
- Lorenzo Paulatto, Danièle Fournier, Massimiliano Marangolo, Mahmoud Eddrief, Paola Atkinson, et al.. Thermal conductivity of Bi 2 Se 3 from bulk to thin films: Theory and experiment. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2020, 101 (20), ⟨10.1103/PhysRevB.101.205419⟩. ⟨hal-02616431⟩
