High Thermoelectric Efficiency of n-type PbS
High Thermoelectric Efficiency of n-type PbS
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DOI：
10.1002/aenm.201200683
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发表时间：
2013-04-01
影响因子：
27.8
通讯作者：
Snyder, G. Jeffrey
中科院分区：
文献类型：
--
作者：
Wang, Heng;Schechtel, Eugen;Snyder, G. Jeffrey
PbS与其它铅硫族化合物PbX（X：Te，Se）具有一些共同的特征，是良好的热电材料。PbS具有潜在的优势，因为它在地球上相当丰富且便宜。在这项工作中，我们调整了具有不同载流子密度的n型单相多晶PbS 1-xClx（x 0.008）的输运性质。氯化铅可提供高达1.2 x 1020 cm 3的近100%有效掺杂控制。在850 K时达到的最大zT为0.7，预测的zT在1000 K时接近1。这大约是以前报道的二进制PbS的两倍（约为0.4）。与其它铅硫族化合物相比，PbS具有较高的有效质量和晶格热导率，是一种较差的热电材料。然而，这项研究还预测了PbS中zT改善的潜力更大的材料工程，如合金化或纳米结构相比，PbSe或PbTe。PbS基材料由于其丰富的资源和低廉的成本，在铅硫族化合物热电材料中具有很强的竞争力。
PbS shares several features with the other lead chalcogenides PbX (X: Te, Se), which are good thermoelectric materials. PbS has a potential advantage in that it is quite earth abundant and inexpensive. In this work we tune the transport properties in n-type, single-phase polycrystalline PbS1-xClx (x 0.008) with different carrier densities. Lead chloride provides a nearly 100% efficient doping control up to 1.2 x 1020 cm3. The maximum zT achieved at 850 K is 0.7 with a predicted zT approximate to 1 at 1000 K. This is about twice as high as what was previously reported (approximate to 0.4) for binary PbS. Compared with the other lead chalcogenides the higher effective mass and higher lattice thermal conductivity makes binary PbS an inferior thermoelectric material. However this study also predicts greater potential of zT improvement in PbS by material engineering such as alloying or nanostructuring compared to PbSe or PbTe. Considering their abundance and low cost, PbS based materials are quite competitive among the lead chalcogenides for thermoelectric applications.