Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe

Wei, Tian-Ran; Tan, Gangjian; Zhang, Xiaomi; Wu, Chao-Feng; Li, Jing-Feng; Dravid, Vinayak P.; Snyder, G. Jeffrey; Kanatzidis, Mercouri G.

doi:10.1021/jacs.6b04181

Title: Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe

Journal Article · Mon Jun 27 00:00:00 EDT 2016 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.6b04181· OSTI ID:1388415

Wei, Tian-Ran ^[1]; Tan, Gangjian ^[2]; Zhang, Xiaomi ^[2]; Wu, Chao-Feng ^[1]; Li, Jing-Feng ^[1]; Dravid, Vinayak P. ^[2]; Snyder, G. Jeffrey ^[2]; Kanatzidis, Mercouri G. ^[2]

Tsinghua Univ., Beijing (China)
Northwestern Univ., Evanston, IL (United States)

Recent findings about ultrahigh thermoelectric performance in SnSe single crystals have stimulated related research on this simple binary compound, which is focused mostly on its polycrystalline counterparts, and particularly on electrical property enhancement by effective doping. The work reported here systematically investigated the thermoelectric properties of polycrystalline SnSe doped with three alkali metals (Li, Na, and K). It is found that Na has the best doping efficiency, leading to an increase in hole concentration from 3.2 × 10¹⁷ to 4.4 × 10¹⁹ cm^–3 at room temperature, accompanied by a drop in Seebeck coefficient from 480 to 142 μV/K. An equivalent single parabolic band model was found adequate to capture the variation tendency of Seebeck coefficient with doping levels within a wide range. A mixed scattering of carriers by acoustic phonons and grain boundaries is suitable for numerically understanding the temperature-dependence of carrier mobility. A maximum ZT of ~0.8 was achieved in 1% Na- or K-doped SnSe at 800 K. Possible strategies to improve the mobility and ZT of polycrystals were also proposed.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); National Basic Research Program of China; National Science Foundation (NSF); International Institute for Nanotechnology (IIN); Keck Foundation; State of Illinois

Grant/Contract Number:: SC0001299; FG02-09ER46577; 2013CB632503; SC0014520

OSTI ID:: 1388415

Journal Information:: Journal of the American Chemical Society, Vol. 138, Issue 28; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 262 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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solar (thermal)
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phonons
thermal conductivity
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mechanical behavior
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spin dynamics
materials and chemistry by design
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synthesis (self-assembly)
synthesis (scalable processing)
impurities
crystal structure
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