Copper tin sulphide (Cu2SnS3, CTS) is a promising p-type thermoelectric material. In the present work,we have investigated the cation disorder in CTS disks made by sintering powders produced via highenergy reactive ball-milling. The crystalline structures, electronic and thermal properties were systematicallyinvestigated. As-milled CTS shows a disordered cubic structure (c-CTS), preserved with thermaltreatment up to 500 C. By increasing the thermal treatment temperature, CTS gradually evolves towardsthe ordered monoclinic structure (m-CTS), reaching complete order at 650 C. The disordered CTS hasseveral times higher zT than the ordered CTS. In fact, ordered CTS has high thermopower, up to 700 mV/K,and high electrical resistivity leading to zT < 0.05 above 700K; whereas, disordered (c-CTS) hascomparatively high zT~0.30 above 700K. This has been related to the lower electrical resistivity, and theultra-low thermal conductivity (k~0.26 W/m-K), resulting from the disordered structure, promotingPhonon-Glass-Electron-Crystal (PGEC) characteristics. In our best knowledge, zT~0.30 above 700K is thehighest in CTS samples without acting on the chemistry of the system.

Ultra-low thermal conductivity and improved thermoelectric performance in disordered nanostructured copper tin sulphide (Cu2SnS3, CTS)

C Fanciulli;A Chiappini;
2020

Abstract

Copper tin sulphide (Cu2SnS3, CTS) is a promising p-type thermoelectric material. In the present work,we have investigated the cation disorder in CTS disks made by sintering powders produced via highenergy reactive ball-milling. The crystalline structures, electronic and thermal properties were systematicallyinvestigated. As-milled CTS shows a disordered cubic structure (c-CTS), preserved with thermaltreatment up to 500 C. By increasing the thermal treatment temperature, CTS gradually evolves towardsthe ordered monoclinic structure (m-CTS), reaching complete order at 650 C. The disordered CTS hasseveral times higher zT than the ordered CTS. In fact, ordered CTS has high thermopower, up to 700 mV/K,and high electrical resistivity leading to zT < 0.05 above 700K; whereas, disordered (c-CTS) hascomparatively high zT~0.30 above 700K. This has been related to the lower electrical resistivity, and theultra-low thermal conductivity (k~0.26 W/m-K), resulting from the disordered structure, promotingPhonon-Glass-Electron-Crystal (PGEC) characteristics. In our best knowledge, zT~0.30 above 700K is thehighest in CTS samples without acting on the chemistry of the system.
2020
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia - ICMATE
Istituto di fotonica e nanotecnologie - IFN
Copper tin sulphide Cu2SnS3
Cubic CTS
Ordered and disordered structure
Phonon-glass-electron-crystal
Reactive ball-milling
Ultra-low thermal conductivity
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/368883
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