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Pressure-induced enhancement of thermoelectric power factor in pristine and hole-doped SnSe crystals

机译：压力诱导提高原始和掺杂SNSE晶体中的热电功率因数

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We evaluate the influence of pressure on the thermoelectric power factors PF equivalent to S-2 sigma of pristine and Na-doped SnSe crystals by measuring their electrical conductivity sigma(T) and Seebeck coefficient S(T) up to similar to 22 kbar with a self-clamped piston-cylinder cell. For both cases, sigma(T) is enhanced while S(T) reduced with increasing pressure as expected, but their imbalanced variations lead to a monotonic enhancement of PF under pressure. For pristine SnSe, sigma(290 K) increases by similar to 4 times from similar to 10.1 to 38 S cm(-1), while S(290 K) decreases by only similar to 12% from 474 to 415 mu V K-1, leading to about three-fold enhancement of PF from 2.24 to 6.61 mu W cm(-1) K-2, which is very close to the optimal value of SnSe above the structural transition at similar to 800 K at ambient pressure. In comparison, the PF of Na-doped SnSe at 290 K is enhanced moderately by similar to 30% up to 20 kbar. In contrast, the PF of isostructural black phosphorus with a simple band structure was found to decrease under pressure. The comparison with black phosphorus indicates that the multi-valley valence band structure of SnSe is beneficial for the enhancement of PF by retaining a large Seebeck coefficient under pressure. Our results also provide experimental confirmation on the previous theoretical prediction that high pressure can be used to optimize the thermoelectric efficiency of SnSe.
机译：通过测量它们的导电Σ（t）和塞贝克系数S（t），评估对原始和Na-掺杂的SnSe晶体的热电电源因子PF对热电电源因子PF的影响，并将其与22 kbar类似于22 kbar自夹闭活塞缸单元。对于这两种情况，Sigma（T）都是增强的，而S（t）随着预期的增加而减小，但它们的不平衡变化导致PF在压力下的单调增强。对于原始的SNSE，Sigma（290 k）与类似于10.1至38秒（-1）相似的4次增加，而S（290 k）仅在474至415μmVk-1中降低12％ ，导致从2.24至6.61μWCM（-1）K-2的PF的三倍提高，这非常接近于在环境压力下类似于800 k的结构过渡的SNSE的最佳值。相比之下，290 k处的Na掺杂的SnSe的PF适度增强，相似至30％至20 kbar。相反，发现具有简单带状结构的异肌黑磷的PF在压力下降低。与黑色磷的比较表明，通过在压力下保持大的塞贝克系数，SNSE的多谷价频带结构是有益的。我们的结果还提供了对先前理论预测的实验证实，即高压可用于优化SNSE的热电效率。

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    《RSC Advances》 |2019年第46期|共7页
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  • 正文语种 eng
  • 中图分类 化学;
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