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- Title
Discovery of colossal Seebeck effect in metallic Cu<sub>2</sub>Se.
- Authors
Byeon, Dogyun; Sobota, Robert; Delime-Codrin, Kévin; Choi, Seongho; Hirata, Keisuke; Adachi, Masahiro; Kiyama, Makoto; Matsuura, Takashi; Yamamoto, Yoshiyuki; Matsunami, Masaharu; Takeuchi, Tsunehiro
- Abstract
Both electrical conductivity σ and Seebeck coefficient S are functions of carrier concentration being correlated with each other, and the value of power factor S2σ is generally limited to less than 0.01 W m−1 K−2. Here we report that, under the temperature gradient applied simultaneously to both parallel and perpendicular directions of measurement, a metallic copper selenide, Cu2Se, shows two sign reversals and colossal values of S exceeding ±2 mV K−1 in a narrow temperature range, 340 K < T < 400 K, where a structure phase transition takes place. The metallic behavior of σ possessing larger magnitude exceeding 600 S cm−1 leads to a colossal value of S2σ = 2.3 W m-1 K-2. The small thermal conductivity less than 2 W m−1 K−1 results in a huge dimensionless figure of merit exceeding 400. This unusual behavior is brought about by the self-tuning carrier concentration effect in the low-temperature phase assisted by the high-temperature phase. Recent research efforts have aimed at discovering thermoelectric materials with high efficiency in the middle-low temperature range, where a majority of waste heat is lost to the ambient. Here, the authors discover colossal Seebeck coefficient values in metallic copper selenide from 340 K to 400 K.
- Publication
Nature Communications, 2019, Vol 10, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-018-07877-5