Lim, Sang-Soon Kim, Byung Kyu Kim, Seong Keun Park, Hyung-Ho Kim, Dong-Ik Hyun, Dow-Bin Kim, Jin-Sang Baek, Seung-Hyub 2024-01-20T00:00:31Z 2024-01-20T00:00:31Z 2021-09-03 2017-12-15 0925-8388 https://pubs.kist.re.kr/handle/201004/121913 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. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA PERFORMANCE POWER A two-step synthesis process of thermoelectric alloys for the separate control of carrier density and mobility Article 10.1016/j.jallcom.2017.08.089 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.727, pp.191 - 195 JOURNAL OF ALLOYS AND COMPOUNDS 727 191 195 scie scopus 000412712900025 2-s2.0-85027688301 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article PERFORMANCE POWER Thermoelectric Bismuth antimony telluride Carrier density Carrier mobility