Programme

P.9 -- Poster, VCTP-47

Date: Tuesday, 2 August 2022

Time: 08:30 - 10:00

The influence of partial boundary scattering on Seebeck coefficient oscillation in granular thermoelectric thin films

Giang H. Bach1,*, Anh V Tran1, Hung Q. Nguyen2, Kien T. Nguyen2, Huy D. Nguyen1, Toan T. Nguyen1,3

(1) Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam (2) Nano and Energy Center, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam (3) Key Labs for Multi-scale Simulations of Complex Systems, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam

We investigate the Seebeck coefficient oscillations in thermoelectric thin films with rectangular grain structure. Within a relaxation time approximation, the Seebeck coefficient is shown to increase due to inelastic scattering on the grain boundaries along the temperature gradient direction but it decreases with partial scattering on the thickness boundary direction. Quantum effect is distinctly revealed in the variance of oscillation amplitude of the Seebeck coefficient with reducing the grain size. The effective mass of carriers and the Fermi energy of the film are key parameters determining both the amplitude and period of the oscillations.

Presenter: Bach Giang