MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Engineering Materials and Their Applications
Thermoelectric Conversion Efficiency of 4% in Environmental-Friendly Kesterite Single Crystal
Akira NagaokaKatsuma NagatomoKoki NakashimaYuichi HiraiYasuyuki OtaKenji YoshinoKensuke Nishioka
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2023 Volume 64 Issue 10 Pages 2535-2541

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Abstract

Multinary Cu2ZnSnS4 (CZTS)-based materials have attracted considerable attention for thermoelectric (TE) power generation owing to their cost-effectiveness and abundance. The device structure of the CZTS/Au diffusion barrier layer was effective in impeding chemical diffusion during operation; however, its interfacial contact resistance was relatively higher than that of the Bi2Te3 device. We report the discovery of p-type CZTS single crystals with a record-high dimensionless figure of merit (ZT) of 1.6 at 800 K and TE conversion efficiency of ∼4% at a temperature difference of 473 K, which is based on the Te-free concept. This study demonstrated the potential of CZTS-based TE materials for environment-friendly TE power generation.

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© 2023 The Thermoelectrics Society of Japan
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