A two-step synthesis process of thermoelectric alloys for the separate control of carrier density and mobility

Title
A two-step synthesis process of thermoelectric alloys for the separate control of carrier density and mobility
Authors
현도빈김진상김동익백승협김성근임상순김병규박형호
Keywords
Thermoelectric; Bismuth antimony telluride; Carrier density; Carrier mobility
Issue Date
2017-12
Publisher
Journal of alloys and compounds
Citation
VOL 727-195
Abstract
It is challenging to improve the thermoelectric figure-of-merit as its constituent terms such as Seebeck coefficient, electrical conductivity, and thermal conductivity, are inter-related in the way that the enhancement of one term leads to the degradation of others. Therefore, it is highly desirable to design a new synthesis process that allows us to independently control these terms. Here, we report a simple, two-step process combining spark plasma sintering (SPS) and post-annealing (PA) to separately control the carrier density and mobility in the p-type (Bi0.2Sb0.8)(2)Te-3. High-temperature SPS enables enhancing the carrier mobility by reducing scattering sites such as grain boundaries. Then, the following PA at a lower temperature allows tailoring the carrier density without the degradation of mobility. Beyond bismuth telluride-based, room-temperature thermoelectric materials, we believe that our result will provide an insight for the performance enhancement of other thermoelectric materials such as oxide and skutterudite.
URI
http://pubs.kist.re.kr/handle/201004/66521
ISSN
0925-8388
Appears in Collections:
KIST Publication > Article
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