n-Type SnSe2 Oriented-Nanoplate-Based Pellets for High Thermoelectric Performance

Yubo Luo, Yun Zheng, Zhongzhen Luo, Shiqiang Hao, Chengfeng Du, Qinghua Liang, Zhong Li, Khiam Aik Khor, Kedar Hippalgaonkar, Jianwei Xu, Qingyu Yan, Chris Wolverton, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

It is reported that electron doped n-type SnSe2 nanoplates show promising thermoelectric performance at medium temperatures. After simultaneous introduction of Se deficiency and Cl doping, the Fermi level of SnSe2 shifts toward the conduction band, resulting in two orders of magnitude increase in carrier concentration and a transition to degenerate transport behavior. In addition, all-scale hierarchical phonon scattering centers, such as point defects, nanograin boundaries, stacking faults, and the layered nanostructures, cooperate to produce very low lattice thermal conductivity. As a result, an enhanced in-plane thermoelectric figure of merit ZTmax of 0.63 is achieved for a 1.5 at% Cl doped SnSe1.95 pellet at 673 K, which is much higher than the corresponding in-plane ZT of pure SnSe2 (0.08).

Original languageEnglish
Article number1702167
JournalAdvanced Energy Materials
Volume8
Issue number8
DOIs
Publication statusPublished - Mar 15 2018

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Phonon scattering
Stacking faults
Point defects
Fermi level
Conduction bands
Carrier concentration
Nanostructures
Thermal conductivity
Doping (additives)
Electrons
Temperature

Keywords

  • chlorine doping
  • nanoplate orientation
  • Se deficiency
  • SnSe
  • thermoelectric

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

n-Type SnSe2 Oriented-Nanoplate-Based Pellets for High Thermoelectric Performance. / Luo, Yubo; Zheng, Yun; Luo, Zhongzhen; Hao, Shiqiang; Du, Chengfeng; Liang, Qinghua; Li, Zhong; Khor, Khiam Aik; Hippalgaonkar, Kedar; Xu, Jianwei; Yan, Qingyu; Wolverton, Chris; Kanatzidis, Mercouri G.

In: Advanced Energy Materials, Vol. 8, No. 8, 1702167, 15.03.2018.

Research output: Contribution to journalArticle

Luo, Y, Zheng, Y, Luo, Z, Hao, S, Du, C, Liang, Q, Li, Z, Khor, KA, Hippalgaonkar, K, Xu, J, Yan, Q, Wolverton, C & Kanatzidis, MG 2018, 'n-Type SnSe2 Oriented-Nanoplate-Based Pellets for High Thermoelectric Performance', Advanced Energy Materials, vol. 8, no. 8, 1702167. https://doi.org/10.1002/aenm.201702167
Luo, Yubo ; Zheng, Yun ; Luo, Zhongzhen ; Hao, Shiqiang ; Du, Chengfeng ; Liang, Qinghua ; Li, Zhong ; Khor, Khiam Aik ; Hippalgaonkar, Kedar ; Xu, Jianwei ; Yan, Qingyu ; Wolverton, Chris ; Kanatzidis, Mercouri G. / n-Type SnSe2 Oriented-Nanoplate-Based Pellets for High Thermoelectric Performance. In: Advanced Energy Materials. 2018 ; Vol. 8, No. 8.
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AU - Zheng, Yun

AU - Luo, Zhongzhen

AU - Hao, Shiqiang

AU - Du, Chengfeng

AU - Liang, Qinghua

AU - Li, Zhong

AU - Khor, Khiam Aik

AU - Hippalgaonkar, Kedar

AU - Xu, Jianwei

AU - Yan, Qingyu

AU - Wolverton, Chris

AU - Kanatzidis, Mercouri G

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AB - It is reported that electron doped n-type SnSe2 nanoplates show promising thermoelectric performance at medium temperatures. After simultaneous introduction of Se deficiency and Cl doping, the Fermi level of SnSe2 shifts toward the conduction band, resulting in two orders of magnitude increase in carrier concentration and a transition to degenerate transport behavior. In addition, all-scale hierarchical phonon scattering centers, such as point defects, nanograin boundaries, stacking faults, and the layered nanostructures, cooperate to produce very low lattice thermal conductivity. As a result, an enhanced in-plane thermoelectric figure of merit ZTmax of 0.63 is achieved for a 1.5 at% Cl doped SnSe1.95 pellet at 673 K, which is much higher than the corresponding in-plane ZT of pure SnSe2 (0.08).

KW - chlorine doping

KW - nanoplate orientation

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KW - SnSe

KW - thermoelectric

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