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Microstrain release decouples electronic and thermal conductivity in powder aerosol deposited films

Title data

Nazarenus, Tobias ; Schlesier, Kira ; Lebeda, Flora ; Retsch, Markus ; Moos, Ralf:
Microstrain release decouples electronic and thermal conductivity in powder aerosol deposited films.
In: Materials Letters. Vol. 322 (2022) . - No. 132461.
ISSN 0167-577X
DOI: https://doi.org/10.1016/j.matlet.2022.132461

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
Aerosolbasierte Kaltabscheidung: Co-Deposition von Funktionsmaterialien und Füllstoffen zur Substitution einer nachfolgenden WärmebehandlungMO-1060/37-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Decoupling electronic and thermal conductivity in nanostructured materials has been a major challenge in the field of electronics and thermoelectrics. Using powder aerosol deposition (PAD) in combination with photothermal post-treatment, we report a nanostructured material where the electric conductivity drastically increases without affecting the thermal conductivity. Working with delafossite, CuFe0.98Sn0.02O2, we demonstrate that PAD results in films with a significant microstrain between the nanosized crystallites. Photothermal treatment releases the atomic lattice strain but retains the nanocrystalline structure. We interpret that the increase in conductivity results from a higher charge carrier mobility due to a reduction in lattice deformation. In contrast, the nanocrystalline microstructure leads to a low thermal film conductivity, which is unaffected by the post-treatment. This unique observation paves the way to unravel a mechanism to access materials with an improved thermoelectric figure of merit.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 23 May 2022 06:27
Last Modified: 23 May 2022 06:27
URI: https://eref.uni-bayreuth.de/id/eprint/69671