期刊
ENERGY STORAGE MATERIALS
卷 10, 期 -, 页码 130-138出版社
ELSEVIER
DOI: 10.1016/j.ensm.2017.08.014
关键词
Thermoelectric materials; Tin selenide; Solvothermal synthesis; Self-doping; Anisotropy-strengthening
资金
- Australian Research Council
In this study, we report a record peak Figure of Merit (ZT) of 1.36 +/- 0.12 in polycrystalline Sn0.98Se macro-sized plates, fabricated via a facile solvothermal method. The obtained exceptional thermoelectric performance comes from their high power factor of 6.95 mu Wcm(-1)K(-2) and ultra-low thermal conductivity of 0.42 Wm(-1)K(-1) at 823 K. Through our Hall measurements, we found the high carrier concentration of 1.5 x 1019 cm(-3) derived from the self-doping, which contributes to a high electrical conductivity and a moderate Seebeck coefficient. Moreover, detailed structural characterizations reveal a strong preferred orientation in our sintered Sn0.98Se pellets. The phonon scattering sources such as grain boundaries, synergistically coupled with the anharmonicity boding of Sn0.98Se crystals with a high density of 98.5%, result in an intrinsic ultra-low thermal conductivity. This study provides a new perspective to achieve high thermoelectric performance in polycrystalline SnSe materials.
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