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High-Performance Ag–Se-Based n-Type Printed Thermoelectric Materials for High Power Density Folded Generators

Mallick, Md Mofasser ORCID iD icon 1; Rösch, Andres Georg ORCID iD icon 1; Franke, Leonard 1; Ahmed, Sarfraz 2; Gall, Andre 1; Geßwein, Holger 3; Aghassi, Jasmin ORCID iD icon 2; Lemmer, Uli 1,4
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
3 Karlsruher Institut für Technologie (KIT)
4 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

High-performance Ag–Se-based n-type printed thermoelectric (TE) materials suitable for room-temperature applications have been developed through a new and facile synthesis approach. A high magnitude of the Seebeck coefficient up to 220 μV K–1 and a TE power factor larger than 500 μW m–1 K–2 for an n-type printed film are achieved. A high figure-of-merit ZT ∼0.6 for a printed material has been found in the film with a low in-plane thermal conductivity κF of ∼0.30 W m–1 K–1. Using this material for n-type legs, a flexible folded TE generator (flexTEG) of 13 thermocouples has been fabricated. The open-circuit voltage of the flexTEG for temperature differences of ΔT = 30 and 110 K is found to be 71.1 and 181.4 mV, respectively. Consequently, very high maximum output power densities pmax of 6.6 and 321 μW cm–2 are estimated for the temperature difference of ΔT = 30 K and ΔT = 110 K, respectively. The flexTEG has been demonstrated by wearing it on the lower wrist, which resulted in an output voltage of ∼72.2 mV for ΔT ≈ 30 K. Our results pave the way for widespread use in wearable devices.

DOI: 10.1021/acsami.0c01676
Zitationen: 49
Zitationen: 55
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Institut für Mikrostrukturtechnik (IMT)
Institut für Nanotechnologie (INT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.04.2020
Sprache Englisch
Identifikator ISSN: 1944-8244, 1944-8252
KITopen-ID: 1000118397
HGF-Programm 43.22.03 (POF III, LK 01) Printed Materials and Systems
Erschienen in ACS applied materials & interfaces
Verlag American Chemical Society (ACS)
Band 12
Heft 17
Seiten 19655–19663
Projektinformation EXC 2082; 3DMM2O (DFG, DFG EXSTRAT, EXC 2082/1, zu FOR_APH_20_03_25+08-58-20)
Vorab online veröffentlicht am 08.04.2020
Schlagwörter silver selenides printed thermoelectrics low thermal conductivity thin films wearable device
Nachgewiesen in Scopus
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