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| Pàgina inicial > Articles > Articles publicats > Influence of copper telluride nanodomains on the transport properties of n-type bismuth telluride |
(Institut de Recerca en Energia de Catalunya) (Institut de Recerca en Energia de Catalunya) (Institute of Science and Technology Austria) (Institut de Recerca en Energia de Catalunya) (Institut de Recerca en Energia de Catalunya) (Institute of Science and Technology Austria) (Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica) (Institut Català de Nanociència i Nanotecnologia) (Institute of Science and Technology Austria) (Istituto Italiano di Tecnologia) (Institució Catalana de Recerca i Estudis Avançats)
| Data: | 2021 |
| Resum: | The high processing cost, poor mechanical properties and moderate performance of BiTe-based alloys used in thermoelectric devices limit the cost-effectiveness of this energy conversion technology. Towards solving these current challenges, in the present work, we detail a low temperature solution-based approach to produce BiTe-CuTe nanocomposites with improved thermoelectric performance. Our approach consists in combining proper ratios of colloidal nanoparticles and to consolidate the resulting mixture into nanocomposites using a hot press. The transport properties of the nanocomposites are characterized and compared with those of pure BiTe nanomaterials obtained following the same procedure. In contrast with most previous works, the presence of CuTe nanodomains does not result in a significant reduction of the lattice thermal conductivity of the reference BiTe nanomaterial, which is already very low. However, the introduction of CuTe yields a nearly threefold increase of the power factor associated to a simultaneous increase of the Seebeck coefficient and electrical conductivity at temperatures above 400 K. Taking into account the band alignment of the two materials, we rationalize this increase by considering that CuTe nanostructures, with a relatively low electron affinity, are able to inject electrons into BiTe, enhancing in this way its electrical conductivity. The simultaneous increase of the Seebeck coefficient is related to the energy filtering of charge carriers at energy barriers within BiTe domains associated with the accumulation of electrons in regions nearby a CuTe/BiTe heterojunction. Overall, with the incorporation of a proper amount of CuTe nanoparticles, we demonstrate a 250% improvement of the thermoelectric figure of merit of Bi2Te3. |
| Ajuts: | European Commission 754411 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2017-0706 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1246 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 |
| Nota: | A la versió preprint de l'article no hi apareixen Pablo Guardia, Josep Joan Roa i Mirko Prato. |
| Nota: | Altres ajuts: ICN2 is funded by the CERCA Program/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Auto?noma de Barcelona Materials Science PhD program. |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió sotmesa a revisió |
| Matèria: | Bi2Te3 ; Nanocomposites ; Energy filtering effect ; Cu2-xTe ; Thermoelectricity |
| Publicat a: | Chemical engineering journal, Vol. 418 (Aug. 2021) , art. 129374, ISSN 1873-3212 |
26 p, 3.2 MB |
