Thermoelectric Conversion Efficiency of 4% in Environmental-Friendly Kesterite Single Crystal

Akira Nagaoka; Katsuma Nagatomo; Koki Nakashima; Yuichi Hirai; Yasuyuki Ota; Kenji Yoshino; Kensuke Nishioka

doi:10.2320/matertrans.MT-E2023002

Engineering Materials and Their Applications

Thermoelectric Conversion Efficiency of 4% in Environmental-Friendly Kesterite Single Crystal

Akira Nagaoka, Katsuma Nagatomo, Koki Nakashima, Yuichi Hirai, Yasuyuki Ota, Kenji Yoshino, Kensuke Nishioka

著者情報

Akira Nagaoka
Research Center for Sustainable Energy & Environmental Engineering, University of Miyazaki
Electrical and Electronic Engineering Program, University of Miyazaki
Katsuma Nagatomo
Department of Applied Physics and Electronic Engineering, University of Miyazaki
Koki Nakashima
Department of Applied Physics and Electronic Engineering, University of Miyazaki
Yuichi Hirai
Department of Electrical and Systems Engineering, University of Miyazaki
Yasuyuki Ota
Research Center for Sustainable Energy & Environmental Engineering, University of Miyazaki
Electrical and Electronic Engineering Program, University of Miyazaki
Department of Electrical and Systems Engineering, University of Miyazaki
Kenji Yoshino
Electrical and Electronic Engineering Program, University of Miyazaki
Department of Applied Physics and Electronic Engineering, University of Miyazaki
Kensuke Nishioka
Research Center for Sustainable Energy & Environmental Engineering, University of Miyazaki
Electrical and Electronic Engineering Program, University of Miyazaki

キーワード: Cu₂ZnSnS₄, kesterite material, sulfide, thermoelectric material

ジャーナルフリー HTML

2023 年 64 巻 10 号 p. 2535-2541

DOI https://doi.org/10.2320/matertrans.MT-E2023002

詳細

抄録

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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