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Optimizing the average power factor of p-type (Na, Ag) co-doped polycrystalline SnSe

机译：优化P型（NA，AG）共掺杂多晶SNSE的平均功率因数

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摘要

Despite the achievable high thermoelectric properties in SnSe single crystals, the poor mechanical properties and the relatively high cost of synthesis restrict the large scale commercial application of SnSe. Herein, we reported that co-doping with Na and Ag effectively improves the thermoelectric properties of polycrystalline SnSe. Temperature-dependent carrier mobility indicates that the grain boundary scattering is the dominant scattering mechanism near room temperature, giving rise to low electrical conductivity for the polycrystalline SnSe in comparison with that of the single crystal. Co-doping with Na and Ag improves the electrical conductivity of polycrystalline SnSe with a maximum value of 90.1S cm(-1) at 323 K in Na0.005Ag0.015Sn0.98Se, and the electrical conductivity of the (Na, Ag) co-doped samples is higher than that of the single doped samples over the whole temperature range (300-773 K). Considering the relatively high Seebeck coefficient of 335 V K-1 at 673 K and the minimum thermal conductivity of 0.48 W m(-1) K-1 at 773 K, Na0.005Ag0.015Sn0.98Se is observed to have the highest PF and ZT among the series of samples, with values of 0.50 mW cm(-1) K-2 and 0.81 at 773 K, respectively. Its average PF and ZT are 0.43 mW cm(-1) K-2 and 0.37, which is 92% and 68% higher than that of Na0.02Sn0.98Se, 40% and 43% higher than that of Ag0.02Sn0.98Se, and 304% and 277% higher than that of the previously reported SnSe, respectively.
机译：尽管SNSE单晶可实现的高热电性能，但机械性能差和合成成本相对较高限制了SNSE的大规模商业应用。在此，我们报道了用Na和Ag的共掺杂有效地改善了多晶SnSE的热电性能。温度依赖性载流子迁移率表明晶界散射是在室温附近的主要散射机制，与单晶的相比，对多晶SNSE的电导率低产生低电导率。用Na和Ag的共掺杂改善了在Na0.005AG0.015SN0.98S中的323k的最大值为90.1scm（-1）的多晶Snse的电导率，以及（Na，Ag）Co的电导率 - 在整个温度范围内高于单掺杂样品的样品（300-773 k）。考虑到在673k的335V k-1的相对较高的Seebeck系数，并且观察到773k，Na0.005Ag0.015sn0.98se的0.48W m（-1）k-1的最小导热率为773k，最高的PF和ZT在一系列样品中，分别为0.50mW cm（-1）k-2和0.81的值，分别为773k。其平均PF和ZT为0.43mW cm（-1）k-2和0.37，比Na0.02sn0.98se高出92％和68％，40％和43％高于Ag0.02sn0.98se分别比先前报告的SNSE高304％和277％。

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  • 来源
    《RSC Advances》 |2019年第13期|共8页
  • 作者

    Wang Si; Su Xianli; Bailey Trevor P.; Hu Tiezheng; Zhang Zhengkai; Tan Gangjian; Yan Yonggao; Liu Wei; Uher Ctirad; Tang Xinfeng;

  • 作者单位

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Univ Michigan Dept Phys Ann Arbor MI 48109 USA;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

    Univ Michigan Dept Phys Ann Arbor MI 48109 USA;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Hubei Peoples R China;

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