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. 2016 Dec 12;7:13713. doi: 10.1038/ncomms13713

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Copyright © 2016, The Author(s)

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Small ZT values were observed in undoped and light Bi-doped samples. ZT value can be dramatically enhanced with a high carrier concentration. The maximum ZT value along c axis is 2.1 at 733 K in the sample with carrier densities of 2.1 × 10¹⁹ cm⁻³. Error bars are described in Supplementary Note 1.