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(a) Seebeck coefficients, (b) electrical conductivities and (c) thermoelectric PFs of undoped and different Bi contents—doped SnSe single crystals, (d) thermal conductivities of different Bi contents—doped SnSe single crystals. Bi-doped samples become n-type, in agreement with the Hall data. Error bars are described in Supplementary Note 1.
