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New frontier in printed thermoelectrics: Formation of β-Ag$_{2}$Se through thermally stimulated dissociative adsorption leads to high ZT

Mallick, Md Mofasser; Rösch, Andres Georg; Franke, Leonard; Gall, Andre; Ahmad, Sarfraz; Gesswein, Holger; Mazilkin, Andrey; Kuebel, Christian; Lemmer, Uli

Abstract (englisch):
Printed thermoelectrics (TE) could significantly reduce the production cost of energy harvesting devices by large-scale manufacturing. However{,} developing a high-performance printable TE material is a substantial challenge. In this work{,} a new one-pot synthesis and processing of high-performance Ag2Se based n-type printed TE materials is reported. Structural analyses reveal that orthorhombic β-Ag2Se is the dominant phase in the n-type printed material compounds. For a printed material at room temperature{,} a breakthrough power-factor of ~ 17 μWcm-1K-2 with a record high figure-of-merit ZT ~ 1.03 is achieved. A high average ZT{,} an important parameter for device applications{,} of ⁓0.85-0.60 has been realized in a temperature range from 300 K to 400 K. Using this material for n-type legs in combination with commercially available PEDOT:PSS for p-type legs{,} a printed TE generator (print-TEG) of two thermocouples has been fabricated. An output voltage of 17.6 mV and a high maximum power output Pmax of 0.19 µW are achieved using the print-TEG at ΔT=75 K.

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DOI: 10.1039/D0TA05859A
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
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000122115
Erschienen in Journal of materials chemistry / A
Projektinformation 3DMM2O (DFG, DFG EXSTRAT, EXC 2082/1)
Vorab online veröffentlicht am 17.07.2020
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