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Enhancement of thermoelectric properties in rapidly synthesised β-Cu2Se using optimized Cu content and microwave hybrid heating
Author(s)
Gobpant, Jakrit
Harnwunggmoung, Adul
Voraud, Athorn
Date Issued
January 15, 2024
Type
Article
Abstract
To our knowledge, this is the first study to successfully synthesise high-temperature-phase copper selenide (β-Cu2Se) at room temperature using rapid microwave hybrid heating (MHH). Controlling the starting Cu/Se ratio is the critical parameter for adjusting the content of α- and β-phases in the as-synthesised sample. The relatively low Cu composition causes impurities to form in the Cu3Se2 phase, deteriorating the thermoelectric (TE) properties of the Cu2Se material. The β phase formation at room temperature promotes electrical conductivity. The thermal conductivities of the Cu2.0Se samples were 0.5–0.8 Wm−1K−1 at 303–673 K. A strong electronic-phonon interaction may potentially couple electronic thermal conductivity (κe) and lattice thermal conductivity (κL), resulting in incomplete separability of κL and κe in the β-Cu2.0Se sample. The Cu2.0Se exhibited a ZT value of 0.65 at 523 K because of its considerably lowered thermal conductivity.
Citation
Ceramics International, 50(2), 3680-3685, 2024