Journal of the American Chemical Society
Journal of the American Chemical Society
5 years ago

Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering

Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering
Rafal E. Dunin-Borkowski, Lei Zheng, Peng Qin, Jing Feng, Fengshan Zheng, Li-Dong Zhao, Lei Jin, Zhen-Hua Ge, Xin Qian, Dongsheng Song, Xiaoyu Chong
We report the high thermoelectric performance of p-type polycrystalline SnSe obtained by the synergistic tailoring of band structures and atomic-scale defect phonon scattering through (Na,K)-codoping. The energy offsets of multiple valence bands in SnSe are decreased after Na doping and further reduced by (Na,K)-codoping, resulting in an enhancement in the Seebeck coefficient and an increase in the power factor to 492 μW m–1 K–2. The lattice thermal conductivity of polycrystalline SnSe is decreased by the introduction of effective phonon scattering centers, such as point defects and antiphase boundaries. The lattice thermal conductivity of the material is reduced to values as low as 0.29 W m–1 K–1 at 773 K, whereas ZT is increased from 0.3 for 1% Na-doped SnSe to 1.2 for 1% (Na,K)-codoped SnSe.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b05339

DOI: 10.1021/jacs.7b05339

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