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Title: Record Seebeck coefficient and extremely low thermal conductivity in nanostructured SnSe

SnSe has been prepared by arc-melting, as mechanically robust pellets, consisting of highly oriented polycrystals. This material has been characterized by neutron powder diffraction (NPD), scanning electron microscopy, and transport measurements. A microscopic analysis from NPD data demonstrates a quite perfect stoichiometry SnSe{sub 0.98(2)} and a fair amount of anharmonicity of the chemical bonds. The Seebeck coefficient reaches a record maximum value of 668 μV K{sup −1} at 380 K; simultaneously, this highly oriented sample exhibits an extremely low thermal conductivity lower than 0.1 W m{sup −1} K{sup −1} around room temperature, which are two of the main ingredients of good thermoelectric materials. These excellent features exceed the reported values for this semiconducting compound in single crystalline form in the moderate-temperatures region and highlight its possibilities as a potential thermoelectric material.
Authors:
; ; ; ; ;  [1]
  1. Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, E-28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
22412730
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMICAL BONDS; MELTING; MONOCRYSTALS; NANOSTRUCTURES; NEUTRON DIFFRACTION; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; SEEBECK EFFECT; STOICHIOMETRY; TEMPERATURE RANGE 0273-0400 K; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS; TIN SELENIDES