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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.
Bd. 322
(2022)
.
- 132461.
ISSN 0167-577X
DOI: https://doi.org/10.1016/j.matlet.2022.132461
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Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID Aerosolbasierte Kaltabscheidung: Co-Deposition von Funktionsmaterialien und Füllstoffen zur Substitution einer nachfolgenden Wärmebehandlung MO-1060/37-1 |
|---|---|
| Projektfinanzierung: |
Deutsche Forschungsgemeinschaft |
Abstract
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.