Manipulation of ionized impurity scattering for achieving high thermoelectric performance in n-type Mg 3 Sb 2 -based materials

Mao, Jun; Shuai, Jing; Song, Shaowei; Wu, Yixuan; Dally, Rebecca; Zhou, Jiawei; Liu, Zihang; Sun, Jifeng; Zhang, Qinyong; dela Cruz, Clarina; Wilson, Stephen; Pei, Yanzhong; Singh, David J.; Chen, Gang; Chu, Ching-Wu; Ren, Zhifeng

doi:10.1073/pnas.1711725114

Title: Manipulation of ionized impurity scattering for achieving high thermoelectric performance in n-type Mg ₃ Sb ₂ -based materials

Journal Article · Mon Sep 18 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1711725114· OSTI ID:1392688

Mao, Jun; Shuai, Jing; Song, Shaowei; Wu, Yixuan; Dally, Rebecca; Zhou, Jiawei; Liu, Zihang; Sun, Jifeng; Zhang, Qinyong; dela Cruz, Clarina; Wilson, Stephen; Pei, Yanzhong; Singh, David J.; Chen, Gang; Chu, Ching-Wu; Ren, Zhifeng

Achieving higher carrier mobility plays a pivotal role for obtaining potentially high thermoelectric performance. In principle, the carrier mobility is governed by the band structure as well as by the carrier scattering mechanism. Here, we demonstrate that by manipulating the carrier scattering mechanism in n-type Mg₃Sb₂-based materials, a substantial improvement in carrier mobility, and hence the power factor, can be achieved. In this work, Fe, Co, Hf, and Ta are doped on the Mg site of Mg_3.2Sb_1.5Bi_0.49Te_0.01, where the ionized impurity scattering crosses over to mixed ionized impurity and acoustic phonon scattering. A significant improvement in Hall mobility from ~16 to ~81 cm²∙V^-1∙s^-1 is obtained, thus leading to a notably enhanced power factor of ~13 μW∙cm^-1∙K^-2 from ~5 μW∙cm^-1∙K^-2. A simultaneous reduction in thermal conductivity is also achieved. Collectively, a figure of merit (ZT) of ~1.7 is obtained at 773 K in Mg_3.1Co_0.1Sb_1.5Bi_0.49Te_0.01. The concept of manipulating the carrier scattering mechanism to improve the mobility should also be applicable to other material systems.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

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

Grant/Contract Number:: SC0001299; FG02-09ER46577

OSTI ID:: 1392688

Alternate ID(s):: OSTI ID: 1470514

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 114 Journal Issue: 40; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 236 works

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Title: Manipulation of ionized impurity scattering for achieving high thermoelectric performance in n-type Mg 3 Sb 2 -based materials

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Title: Manipulation of ionized impurity scattering for achieving high thermoelectric performance in n-type Mg ₃ Sb ₂ -based materials