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Flexible Bi2Te3 Films on Polymer Sheets Prepared by the Powder Aerosol Deposition Method at Room Temperature

Title data

Werner, Robin ; Matejka, Johanna S. ; Schönauer-Kamin, Daniela ; Moos, Ralf:
Flexible Bi2Te3 Films on Polymer Sheets Prepared by the Powder Aerosol Deposition Method at Room Temperature.
Event: 18th European Conference on Thermoelectrics, ECT'22 , 14.-16. Sept. 2022 , Barcelona, Spain.
(Conference item: Conference , Poster )

Abstract in another language

The development of flexible thermoelectric generators (TEG), especially for near-body applications, has become increasingly important. However, it is challenging to produce them because flexible substrates such as polymers are temperature-sensitive and efficient thermoelectric materials such as Bi2Te3 usually require high temperature manufacturing steps. With the powder aerosol deposition (PAD), we present a spray-coating process that allows the fabrication of dense metallic or ceramic films at room temperature. The films are produced directly from the starting powder without a thermal treatment. The PAD can be used to coat ceramic, glass, metallic, as well as temperature-sensitive polymer substrates. In our contribution, we report on the fabrication of flexible Bi2Te3 films on polymer substrates using the PAD. The films were prepared using commercially available 99.9% Bi2Te3 and subsequently thermoelectrically characterized. In order to evaluate the flexibility of the films (width 10 mm, length 25 mm, thickness 10 ± 5 μm), the thermoelectric characterization is carried out both in the non-bent and in the bent state, the latter down to a radius of 10 mm. The Seebeck coefficient remains unaffected by both the number of bends and the bending radius in all measurements. In contrary, the electrical conductivity slightly decreases with decreasing radius. However, the conductivity partially recovers after measuring in the non-bent state again. A possible explanation therefore could be the nanocrystalline morphology, a typical PAD feature, which may lead to small microcracks during bending, which subsequently recover after bending in the planar state. Overall, it can be summarized that the PAD offers enormous potential for the further development of rigid or flexible TEGs.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: 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 Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 27 Sep 2022 08:03
Last Modified: 27 Sep 2022 08:03