High thermoelectric performance in (Bi0.25Sb0.75)2Te3 due to band convergence and improved by carrier concentration control

Kim, Hyun-Sik; Heinz, Nicholas A.; Gibbs, Zachary M.; Tang, Yinglu; Kang, Stephen D.; Snyder, G. Jeffrey

doi:10.1016/j.mattod.2017.02.007

High thermoelectric performance in (Bi_0.25Sb_0.75)₂Te₃ due to band convergence and improved by carrier concentration control

Journal Article · Wed Jun 28 00:00:00 EDT 2017 · Materials Today

DOI:https://doi.org/10.1016/j.mattod.2017.02.007· OSTI ID:1470452

^[1]; Heinz, Nicholas A. ^[2]; Gibbs, Zachary M. ^[2]; Tang, Yinglu ^[3]; ^[3]; Snyder, G. Jeffrey ^[3]

Northwestern Univ., Evanston, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States); Samsung Advanced Institute of Technology, Samsung Electronics (South Korea)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Northwestern Univ., Evanston, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)

Bi₂Te₃ has been recognized as an important cooling material for thermoelectric applications. Yet its thermoelectric performance could still be improved. Here we propose a band engineering strategy by optimizing the converging valence bands of Bi₂Te₃ and Sb₂Te₃ in the (Bi_1-xSb_x)₂Te₃ system when x = 0.75. Band convergence successfully explains the sharp increase in density-of-states effective mass yet relatively constant mobility and optical band gap measurement. This band convergence picture guides the carrier concentration tuning for optimum thermoelectric performance. To synthesize homogeneous textured and optimally doped (Bi_0.25Sb_0.75)₂Te₃, excess Te was chosen as the dopant. Uniform control of the optimized thermoelectric composition was achieved by zone-melting which utilizes separate solidus and liquidus compositions to obtain zT = 1.05 (at 300 K) without nanostructuring.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Massachusetts Inst. of Technology, Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001299; SC0001299

OSTI ID:: 1470452

Journal Information:: Materials Today, Journal Name: Materials Today Journal Issue: 8 Vol. 20; ISSN 1369-7021

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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