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Enhancement of thermoelectric figure-of-merit by resonant states of aluminium doping in lead selenide

2011; Royal Society of Chemistry; Volume: 5; Issue: 1 Linguagem: Inglês

10.1039/c1ee02465e

1754-5706

Qinyong Zhang, Hui Wang, Weishu Liu, Dandan Wang, Bo Yu, Qian Zhang, Zhiting Tian, George Ni, Sangyeop Lee, Keivan Esfarjani, Gang Chen, Zhifeng Ren,

Advanced Thermodynamics and Statistical Mechanics

By adding aluminium (Al) into lead selenide (PbSe), we successfully prepared n-type PbSe thermoelectric materials with a figure-of-merit (ZT) of 1.3 at 850 K. Such a high ZT is achieved by a combination of high Seebeck coefficient caused by very possibly the resonant states in the conduction band created by Al dopant and low thermal conductivity from nanosized phonon scattering centers.