Reduction of the thermal conductivity of the thermoelectric material ScN by Nb alloying | Zendy

Nina Tureson | Zendy; Ngo Van g | Zendy; Danièle Fournier | Zendy; Niraj K. Singh | Zendy; S. Acharya | Zendy; Susann Schmidt | Zendy; Laurent Belliard | Zendy; Ajay Soni | Zendy; Arnaud le Febvrier | Zendy; Per Eklund | Zendy

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Reduction of the thermal conductivity of the thermoelectric material ScN by Nb alloying

Author(s) -

Nina Tureson,

Ngo Van g,

Danièle Fournier,

Niraj K. Singh,

S. Acharya,

Susann Schmidt,

Laurent Belliard,

Ajay Soni,

Arnaud le Febvrier,

Per Eklund

Publication year - 2017

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4993913

Subject(s) - thermal conductivity , materials science , thermoelectric effect , seebeck coefficient , phonon scattering , sapphire , thin film , thermoelectric materials , epitaxy , electrical resistivity and conductivity , analytical chemistry (journal) , sputtering , scattering , condensed matter physics , chemistry , optics , nanotechnology , composite material , thermodynamics , laser , physics , electrical engineering , engineering , layer (electronics) , chromatography

ScN-rich (Sc,Nb)N solid solution thin films have been studied, motivated by the promising thermoelectric properties of ScN-based materials. Cubic Sc1-xNbxN films for 0 amp;lt;= x amp;lt;= 0.25 were epitaxially grown by DC reactive magnetron sputtering on a c-plane sapphire substrate and oriented along the (111) orientation. The crystal structure, morphology, thermal conductivity, and thermoelectric and electrical properties were investigated. The ScN reference film exhibited a Seebeck coefficient of -45 mu V/K and a power factor of 6 x 10(-4) W/m K-2 at 750K. Estimated from room temperature Hall measurements, all samples exhibit a high carrier density of the order of 10(21) cm(-3). Inclusion of heavy transition metals into ScN enables the reduction in thermal conductivity by an increase in phonon scattering. The Nb inserted ScN thin films exhibited a thermal conductivity lower than the value of the ScN reference (10.5W m(-1) K-1) down to a minimum value of 2.2 Wm(-1) K-1. Insertion of Nb into ScN thus resulted in a reduction in thermal conductivity by a factor of similar to 5 due to the mass contrast in ScN, which increases the phonon scattering in the material. Published by AIP Publishing.

Funding Agencies|European Research Council under the European Community [335383]; Swedish Foundation for Strategic Research (SSF) through the Future Research Leaders 5 program; Swedish Research Council (VR) [621-2012-4430, 2016-03365]; Knut and Alice Wallenberg Foundation through the Wallenberg Academy Fellows program; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; project NanoCaTe (FP7-NMP) [604647]; project CTEC [1305-00002B]

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