Nanocrystal-based thermoelectric SnTe-NaSbSe2 alloys with strengthened band convergence and reduced thermal conductivity
Nan, Bingfei (Universitat de Barcelona)
Chang, Cheng (Beihang University)
Li, Zhihao (Shandong University)
Kapuria, Nilotpal (Indiana University. Department of Chemistry)
Han, Xu (Institut Català de Nanociència i Nanotecnologia)
Li, Mengyao (Zhengzhou University)
Wang, Hongchao (Shandong University)
Ryan, Kevin M. (University of Limerick. Department of Chemical Sciences)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Cabot i Codina, Andreu (Institució Catalana de Recerca i Estudis Avançats)

Date:	2024
Abstract:	Ternary I-V-VI2 colloidal NaSbSe2 nanocrystals are herein used to improve the performance of lead-free SnTe thermoelectric materials. We showcase a versatile bottom-up engineering approach to produce nanocrystal-based SnTe-NaSbSe2 alloys from the rapid hot press of colloidal nanocrystal building blocks. The incorporation of NaSbSe2 nanocrystals significantly enhances the Seebeck coefficient of SnTe. The band convergence and simultaneous increasing band gap of SnTe-NaSbSe2 alloys are certified by the first-principles density functional theory calculations. Besides, defect engineering generated by the incorporation of NaSbSe2 nanocrystals such as Sn vacancies, substitution point defects, dense dislocations, and strains generated by the NaSbSe2 nanoparticles incorporation result in a dramatic reduction of the lattice thermal conductivity below the amorphous limit of pure SnTe, down to 0. 38 W m-1 K-1. As a consequence, power factors enhance up to 1. 77 mW m-1 K-2, which is ∼193 % higher than that of the pristine SnTe, and thermoelectric figures of merit up to 1. 15 at 823 K for (SnTe)0. 85(NaSbSe2)0. 15 are achieved.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Ministerio de Ciencia e Innovación CEX2021-001214-S
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Thermoelectric ; Nanocrystals ; SnTe ; NaSbSe2 ; Alloy ; Sn vacancies
Published in:	Chemical engineering journal (1996), Vol. 492 (July 2024) , art. 152367, ISSN 1873-3212

DOI: 10.1016/j.cej.2024.152367

Preprint 20 p, 1.7 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles