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Enhanced thermoelectric performance of solution-derived bismuth telluride based nanocomposites via liquid-phase Sintering

AuthorsZhang, Chaohua; Mata, Maria de la ; Belarre, Francisco J. ; Arbiol, Jordi ; Xiong, Qihua
KeywordsBismuth telluride
Liquid-phase sintering
Thermoelectric materials
Issue Date2016
CitationNano Energy 30: 630-638 (2016)
AbstractBismuth telluride based thermoelectric materials show great promise in electricity generation from waste heat and solid-state refrigeration, but improving their conversion efficiency with economical approaches for widespread use remains a challenge. An economical facile bottom-up approach has been developed to obtain nanostructured powders, which are used to build bulk thermoelectric materials. Using excess tellurium as sacrificial additive to enable liquid-phase sintering in the spark plasma sintering process, the lattice and bipolar contributions to the thermal conductivity are both greatly reduced without compromising too much the power factor, which leads to the achievement of high figure of merit (ZT) in both n-type and p-type bismuth telluride based nanocomposites. The ZT values are 1.59±0.16 for p-type BiSbTe and 0.98±0.07 for n-type BiTeSe at 370 K, which are significantly high for bottom-up approaches. These results demonstrate that solution-chemistry approaches as facile, scalable and low-energy-intensive ways to achieve nanopowders, combined with liquid-phase sintering process, can open up great possibilities in developing high-performance low-price thermoelectric bulk nanocomposites.
Descriptionet al.
Identifiersdoi: 10.1016/j.nanoen.2016.10.056
issn: 2211-2855
Appears in Collections:(CIN2) Artículos
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