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

Mallick, Md Mofasser; Rösch, Andres Georg; Franke, Leonard; Ahmed, Sarfraz; Gall, Andre; Geßwein, Holger; Aghassi, Jasmin; Lemmer, Uli

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.



Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Institut für Nanotechnologie (INT)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
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
Seiten acsami.0c01676
Projektinformation 3DMM2O (DFG, DFG EXSTRAT, EXC 2082/1)
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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