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. 2019 Jan 8;10:72. doi: 10.1038/s41467-018-07877-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Temperature dependences of thermoelectric properties of Cu₂Se. a Electrical resistivity, ρ, together with the reference data of the nominal composition Cu₂Se ⁷. b Power factor, PF, displaying two peaks related to negative and positive S(T). c Thermal conductivity, κ, and reference data¹⁸. d Specific heat, C_p, together with the thermal diffusivity, D. e Dimensionless figure of merit ZT. f Region of abnormal behavior in ZT temperature dependence showing two peaks. g The plateau observed in ZT temperature dependence