Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 29, Pages 34543-34549Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08410
Keywords
Ag2Se; liquid-state manipulation; thermoelectric performance; N-type semiconductor; power factor
Funding
- Natural Science Foundation of China [51672278, 11674322]
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The study demonstrates that liquid-phase sintering can lower the thermal conductivity of n-type Ag2Se, leading to improved thermoelectric performance. This approach resulted in the highest reported average ZT value for Ag2Se, showing the potential for designing future thermoelectric materials.
Developing n-type materials with high peak and/or average ZT (ZT is the figure of merit) is an urgent need for the lower ZT of the existing n-type BiTeSe materials compared with the p-type BiSbTe materials. Here, we demonstrate that liquid-phase sintering can lead to lowered thermal conductivity and an improved power factor in n-type Ag2Se, which originates from the greatly lowered electronic thermal conductivity attributed to the decreased mobility and improved Seebeck coefficients because of increased effective mass. Benefiting from this, the maximum ZT (ZT(max)) of similar to 1.21 and the average ZT (ZT(ave)) of 1.06 are successfully achieved in polycrystalline Ag2Se. In this work, ZT(ave) is the highest reported value, being 26% larger than that of Ag2Se reported. Our work shows that liquid-phase sintering to achieve improved thermoelectric (TE) performance opens a great opportunity for designing prospective thermoelectrics.
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