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Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and their Thermoelectric Property Evaluation
Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden.
Department of Physics, University of Istanbul, Fatih, Istanbul, 34135, Turkey.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-9076-5087
Department of Physics, Chemistry and Biology (IFM), SE-581 83 Linköping, Sweden.
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2020 (English)In: Nanomaterials, ISSN 2079-4991, Vol. 10, no 5, article id 854Article in journal (Refereed) Published
Abstract [en]

Reduced energy consumption and environmentally friendly, abundant constituents are gaining more attention for the synthesis of energy materials. A rapid, highly scalable, and process-temperature-sensitive solution synthesis route is demonstrated for the fabrication of thermoelectric Cu2xSe. The process relies on readily available precursors and microwave-assisted thermolysis, which is sensitive to reaction conditions; yielding Cu1.8Se at 200 °C and Cu2Se at 250 °C within 6–8 min reaction time. Transmission electron microscopy (TEM) revealed crystalline nature of as-made particles with irregular truncated morphology, which exhibit a high phase purity as identified by X-ray powder diffraction (XRPD) analysis. Temperature-dependent transport properties were characterized via electrical conductivity, Seebeck coefficient, and thermal diffusivity measurements. Subsequent to spark plasma sintering, pure Cu1.8Se exhibited highly compacted and oriented grains that were similar in size in comparison to Cu2Se, which led to its high electrical and low thermal conductivity, reaching a very high power-factor (24 µW/K−2cm−1). Density-of-states (DOS) calculations confirm the observed trends in electronic properties of the material, where Cu-deficient phase exhibits metallic character. The TE figure of merit (ZT) was estimated for the materials, demonstrating an unprecedentedly high ZT at 875 K of 2.1 for Cu1.8Se sample, followed by 1.9 for Cu2Se. Synthetic and processing methods presented in this work enable large-scale production of TE materials and components for niche applications.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 10, no 5, article id 854
Keywords [en]
thermoelectric, chalcogenides, Cu2−xSe, microwave synthesis, nanomaterial, XPS, ZT, thermal conductivity
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Applied Physics
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URN: urn:nbn:se:ltu:diva-78780DOI: 10.3390/nano10050854PubMedID: 32354142Scopus ID: 2-s2.0-85083973343OAI: oai:DiVA.org:ltu-78780DiVA, id: diva2:1428270
Note

Validerad;2020;Nivå 2;2020-05-11 (johcin)

Available from: 2020-05-05 Created: 2020-05-05 Last updated: 2020-05-11Bibliographically approved

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Råsander, Mikael

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