A. Huynh, M. Eddrief, P. Atkinson, S. Vincent, M. Marangolo, D. Fournier

The current concerns to develop high quality thermoelectric materials and components requires both an understanding of physical phenomena and precise electrical and thermal measurements. A good thermoelectric material must simultaneously have a high Seebeck coefficient, good electrical conductivity(i.e. low electrical resistance, and low thermal conductivity. This project is focused on measuring the thermal properties of new materials, bulk or deposited in thin layers on substrates (thin films or super lattices. We have in the laboratory the means to develop nanostructures or thin layers with good thermoelectric properties, a thermoreflectance microscope which allows the measurement of the thermal conductivity with micrometric spatial resolution and measurements of Seebeck coefficient and electrical conductivity (platform ’low temperatures of SU. We are working in collaboration with L. Paulatto (IMPMC)and M. Calandra (Università di Trento, Italy)

Publications

D. Fournier, M. Marangolo, M. Eddrief, N.N. Kolesnikov, and C. Fretigny, J. Phys. Condens. Matter 30, 115701 (2018).

L. Paulatto, D. Fournier, M. Marangolo, M. Eddrief, P. Atkinson, and M. Calandra, Phys. Rev. B accepted

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