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

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.

View Accepted Manuscript (DOE)

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

Grant/Contract Number:: SC0001299; SC0014520

OSTI ID:: 1388415

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 28 Vol. 138; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Two-step fabrication of single-layer rectangular SnSe flakes Jiang, Jizhou; Wong, Calvin Pei Yu; Zou, Jing 2D Materials, Vol. 4, Issue 2 https://doi.org/10.1088/2053-1583/aa6aec	journal	April 2017
2D SnSe/Si heterojunction for self-driven broadband photodetectors Hao, Lanzhong; Wang, Zegao; Xu, Hanyang 2D Materials, Vol. 6, Issue 3 https://doi.org/10.1088/2053-1583/ab15f7	journal	May 2019
A first-principles theoretical study on the potential thermoelectric properties of MgH ₂ and CaH ₂ Wang, Yunxia; Ohishi, Yuji; Kurosaki, Ken Materials Research Express, Vol. 6, Issue 5 https://doi.org/10.1088/2053-1591/ab0346	journal	February 2019
Effect of sulphur doping in SnSe single crystals on thermoelectric power Patel, Shivam; Chaki, S. H.; Vinodkumar, P. C. Materials Research Express, Vol. 6, Issue 8 https://doi.org/10.1088/2053-1591/ab1d9d	journal	May 2019
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Thermally enhanced Fröhlich coupling in SnSe Caruso, Fabio; Troppenz, Maria; Rigamonti, Santiago Physical Review B, Vol. 99, Issue 8 https://doi.org/10.1103/physrevb.99.081104	journal	February 2019
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
carrier dynamics
charge transport
crystal structure
defects
doping
impurities
materials and chemistry by design
mechanical behavior
optics
phonons
scattering
solar (photovoltaic)
solar (thermal)
solid state lighting
spin dynamics
synthesis (novel materials)
synthesis (scalable processing)
synthesis (self-assembly)
thermal conductivity
thermoelectric

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

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