Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 10, Pages 13070-13078Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c03006
Keywords
thermoelectric performance; Cu3SbSe4; electrical resistivity; thermal conductivity; density of state; figure of merit
Funding
- Natural Science Foundation of China
- [51672278]
- [1217040291]
- [11674322]
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Cu3-yAgySb1-xGexSe4 (x = 0, 0.04, 0.06, 0.08, 0.10, 0.12; y = 0, 0.1, 0.2, 0.3, 0.4) is fabricated using a high-temperature melting process, and its thermoelectric properties are investigated in the temperature range of 300-700 K. Ge doping increases carrier concentration, reducing electrical resistivity, while Ag alloying significantly reduces thermal conductivity and enhances the power factor. Consequently, a maximum figure of merit of 0.95 is achieved for Cu2.7Ag0.3Sb0.94Ge0.06Se4 and Cu2.6Ag0.4Sb0.94Ge0.06Se4 at 700 K, surpassing most reported Cu3SbSe4-based systems.
In this work, Cu3-yAgySb1-xGexSe4 (x = 0, 0.04, 0.06, 0.08, 0.10, 0.12; y = 0, 0.1, 0.2, 0.3, 0.4) is fabricated using a high-temperature melting process, and the thermoelectric properties are investigated in the temperature range of 300-700 K. As a result, a remarkable improvement in thermoelectric performance of Cu-based ternary thermoelectric materials is achieved here. Ge doping increases the carrier concentration leading to a decrease in electrical resistivity; Ag alloying can reduce thermal conductivity significantly and enhance the power factor. Consequently, a maximum figure of merit, 0.95, is obtained for Cu2.7Ag0.3Sb0.94Ge0.06Se4 and Cu2.6Ag0.4Sb0.94Ge0.06Se4 at 700 K, which is higher than most reported Cu3SbSe4-based systems.
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