Phonon properties of materials for wearable thermoelectric generators
Wearable renewable energy generators are an attractive alternative to battery-based systems and can generate power up to a few Watts for portable electronic equipment. Although the most inorganic semiconductor materials are brittle at room temperature the Ag2(SeTeS)1 shows exceptional plastic deformability and high thermoelectric performance making it very interesting material for wearable power generator. Ag2S based compounds shows a remarkebly low lattice thermal conductivity of less than 0.6 Wm¿1K¿1. Phonon dispersion calculations indicates that the weak chemical bonding between Ag and S(SeTe) and their mass difference are responsible for the low lattice thermal conductivity resulting in clear separation between lower energy acoustic region (under 16 meV) and high energy optic band (around 40 meV). We aim to study the phonon DOS of master alloy ¿-Ag2S, and Te; Se alloyed Ag2S0.5Se0.45Te0.05 exhibiting the highest ZT parameter, in 2 states: in highly disordered and well relaxed. The Ag2S0.5Se0.45Te0.05 after casting is amorphous, while after annealing is fully crystalline. We plan to measure 4 samples at two incident neutron energies (19 and 50 meV) at the PANTHER spectrometer.
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FEJERCAK Milos; DURISIN Juraj; FINE Lucas; KOZA Michael Marek; Wanda Mi¿enková; SAKSL KAREL and SULOVA Katarina. (2021). Phonon properties of materials for wearable thermoelectric generators. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-568
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