热电效应
兴奋剂
材料科学
范德瓦尔斯力
塞贝克系数
热电材料
Crystal(编程语言)
微晶
凝聚态物理
电阻率和电导率
相(物质)
光电子学
化学
热力学
物理
冶金
量子力学
有机化学
计算机科学
程序设计语言
分子
作者
Tongwei Ren,Sanyin Qu,Pengfei Qiu,Ming Chen,Xun Shi
摘要
Recently, quasi-one-dimensional van der Waals crystal Ta2PdS6 has been reported as a promising thermoelectric material with an extraordinarily high power factor. However, element doping to tune the thermoelectric properties has not been studied yet. Here, we systematically investigated the effect of Se doping on the phase composition, charge transport properties and thermoelectric performance of Se-doped Ta2Pd(S1−xSex)6 (x = 0, 0.02, 0.05, and 0.07) polycrystalline bulk materials. Upon doping Se at the S sites to increase the carrier concentration and mobility, the electrical conductivity of Ta2Pd(S0.93Se0.07)6 is dramatically enhanced, while the S is slightly reduced, yielding a significantly improved power factor compared to that of pristine Ta2PdS6. Consequently, Ta2Pd(S0.93Se0.07)6 exhibits a peak ZT of 0.29 at 700 K when the doping content x = 0.07, which is more than twice that of pristine Ta2PdS6.
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