Nanostructured kesterite (Cu2ZnSnS4) for applications in thermoelectric devices

Kesterite (Cu2ZnSnS4, CZTS) powders were produced by reactive high-energy milling, starting from stoichiometric mixtures of the elemental components. CZTS forms fine crystals with a cubic structure, which evolves to the stable tetragonal form after thermal treatment. Tablets were produced by cold pr...

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Bibliographic Details
Published in:Powder diffraction 2019-09, Vol.34 (S1), p.S42-S47
Main Authors: Isotta, E., Pugno, N. M., Scardi, P.
Format: Article
Language:English
Subjects:
Ball milling
Cold pressing
Crystal structure
Electrical conduction
Electrical resistivity
Heat conductivity
Heat treatment
Mechanical alloying
Plasma sintering
Porosity
Quantum dots
Seebeck effect
Sintering (powder metallurgy)
Tablets
Technical Articles
Thermal conductivity
Thermal diffusivity
Thermoelectricity
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Summary:Kesterite (Cu2ZnSnS4, CZTS) powders were produced by reactive high-energy milling, starting from stoichiometric mixtures of the elemental components. CZTS forms fine crystals with a cubic structure, which evolves to the stable tetragonal form after thermal treatment. Tablets were produced by cold pressing of the ball milled powder, and sintered up to 660 °C. Seebeck coefficient, electrical resistivity, and thermal diffusivity were measured on the sintered tablets, pointing out the positive effect of CZTS nanostructure and of the rather large fraction of porosity: thermal conductivity is rather low (from ~0.8 W/(m K) at 20 °C to ~0.42 W/(m K) at 500 °C), while electrical conduction is not seriously hindered (electrical resistivity from ~8500 µΩ m at 40 °C to ~2000 µΩ m at 400 °C). Preliminary results of thermoelectric behavior are promising.
ISSN:0885-7156
1945-7413
DOI:10.1017/S0885715619000277