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Long-Term Stability of the Colossal Seebeck Effect in Metallic Cu2Se

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Determination of thermoelectric properties is rather a challenging task, especially during a phase transition, where a drastic change in magnitude of thermoelectric properties is generally observed. In this study, we performed a precise measurement of the Seebeck coefficient on Cu2Se, which was recently reported to possess a colossal Seebeck coefficient with metallic electrical conductivity during a structural phase transition. We confirmed that the colossal Seebeck effect was stable over a long period of time, as high as −0.9 mV under an applied temperature gradient of 1 K. This fact clearly proved that the colossal Seebeck effect observable in metallic Cu2Se is potentially usable for a variety of thermoelectric applications.

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This work is financially supported by JST CREST and JSPS KAKENHI, Grant Nos. 18H01695 and 18K18961.

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Correspondence to Dogyun Byeon.

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Byeon, D., Sobota, R., Singh, S. et al. Long-Term Stability of the Colossal Seebeck Effect in Metallic Cu2Se. Journal of Elec Materi (2020). https://doi.org/10.1007/s11664-019-07884-2

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  • Cu2Se
  • colossal Seebeck effect
  • dynamical method
  • steady-state method