The Role of Ionized Impurity Scattering on the Thermoelectric Performances of 
Rock Salt AgPbmSnSe2+m

Pan, Lin; Mitra, Sunanda; Zhao, Li-Dong; Shen, Yawei; Wang, Yifeng; Felser, Claudia; Berardan, David

doi:10.1002/adfm.201600623

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The Role of Ionized Impurity Scattering on the Thermoelectric Performances of Rock Salt AgPb_mSnSe_2+m

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Pan, Lin
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Pan, L., Mitra, S., Zhao, L.-D., Shen, Y., Wang, Y., Felser, C., et al. (2016). The Role of Ionized Impurity Scattering on the Thermoelectric Performances of Rock Salt AgPb_mSnSe_2+m. Advanced Functional Materials, 26(28), 5149-5157. doi:10.1002/adfm.201600623.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-5629-E

Abstract

This study reports on the successful synthesis and on the properties of polycrystalline AgPbmSnSe2+m (m = 8, 100, 50, 25) samples with a rock salt structure. Between approximate to 160 and approximate to 400 K, the dominant scattering process of the carriers in this system changes from acoustic phonon scattering in PbSe to ionized impurity scattering in AgPbmSnSe2+m, which synergistically optimizes electrical and thermal transport properties. Thanks to the faint amount of AgSnSe2, the Seebeck coefficient is enhanced by boosting the scattering factor, the electric conductivity is improved by the increase of the concentration of holes coupled to a limited degradation of their mobility, and the total thermal conductivity is reduced by suppressing bipolar thermal conductivity. Therefore, ZT of AgPbmSnSe2+m (m = 50) reaches 1.3 at 889 K. The mechanism suggested in this study opens new paths to improve the thermoelectric performances of other families of materials.