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Direct energy conversion of heat into electricity using thermoelectric materials is an attractive solution to help address global energy issues. Developing novel materials composed of earth-abundant and nontoxic elements will aid progress toward the goal of sustainable thermoelectric materials. In this study, we chemically synthesized Cu-Zn-Sn-S nanocrystals and fabricated a Cu 3 ZnSnS 5- y  thermoelectric material using nanocrystals as building blocks. The figure-of-merit ( ZT ) value of the Cu 3 ZnSnS 5- y  material was found to be 0.39 at 658 K. We substituted Zn with Al in the Cu 3 ZnSnS 5- y  system to form Cu 3 Zn 1- x  Al  x  SnS 5- y  ( x = 0.25, 0.5, 0.75, and 1) to lower the lattice thermal conductivity of the resulting materials. Complete substitution of Al for Zn substantially decreased the lattice thermal conductivity and dramatically increased the electrical conductivity of the material. However, the ZT value could not be significantly enhanced, which could be primarily attributed to the high carrier thermal conductivity. These results highlight the production of Cu 3 Zn 1- x  Al  x  SnS 5- y  thermoelectric materials and unveil the scope for improvement of ZT values by altering transport properties.

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Nanobulk Thermoelectric Materials Fabricated from Chemically Synthesized Cu3Zn1–xAlxSnS5–y Nanocrystals