TY  - JOUR
AU  - Ge, Zhen-Hua
AU  - Song, Dongsheng
AU  - Chong, Xiaoyu
AU  - Zheng, Fengshan
AU  - Jin, Lei
AU  - Qian, Xin
AU  - Zheng, Lei
AU  - Dunin-Borkowski, Rafal
AU  - Qin, Peng
AU  - Feng, Jing
AU  - Zhao, Li-Dong
TI  - Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering
JO  - Journal of the American Chemical Society
VL  - 139
IS  - 28
SN  - 1520-5126
CY  - Washington, DC
PB  - American Chemical Society
M1  - FZJ-2017-05663
SP  - 9714 - 9720
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000406172900051
DO  - DOI:10.1021/jacs.7b05339
UR  - https://juser.fz-juelich.de/record/836588
ER  -