Realization of adjustable electron concentration and its effect on electrical- and Seebeck-property of n-type SnSe crystals

Realization of adjustable electron concentration and its effect on electrical- and Seebeck-property of n-type SnSe crystals
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电子浓度可调的实现及其对n型SnSe晶体电学和塞贝克性能的影响

DOI:
10.1063/5.0078990
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发表时间:
2022-01
影响因子:
4
通讯作者:
Yan-Feng Chen
Yan-Feng Chen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xiao-Li Zhou;Yang-Yang Lv;Hang-Fei Zhang;Yi-Xin Zhang;Jian Zhang;Jian Zhou;Shu-Hua Yao;Y. B. Chen;Yan-Feng Chen

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在SnSe晶体中对载流子类型的调控对于制造诸如热电模块等基于SnSe的同质结器件是非常有利的。然而,由于在无故意掺杂时SnSe天然为p型,将其n型载流子调节到最佳水平是极具挑战性的。在此,我们报道了通过卤素或铈(Ce)掺杂实现n型SnSe。重要的是,通过布里奇曼(Bridgeman)方法进行Ce掺杂能够获得重电子掺杂的SnSe单晶(约10¹⁹ cm⁻³)。当电子浓度从10¹⁶增加到10¹⁹ cm⁻³时,所生长的SnSe晶体的电导率从热激活行为转变为金属性的行为。值得注意的是,在300 K时,重电子Ce掺杂的SnSe晶体的功率因子和电子品质因数分别能够达到1.59和0.44 μW cm⁻¹ K⁻²,这是热电n型SnSe中性能最好的之一。这项工作表明,通过布里奇曼方法进行Ce掺杂是进一步提高n型SnSe晶体热电性能的理想途径。
Manipulation of carrier types in SnSe crystals is quite advantageous to fabricate SnSe-based homojunction devices such as thermoelectric modules. However, tuning the n-type charge carrier at an optimal level of SnSe is quite challenging because of its natural p-type without intentional doping. Here, we report the realization of the n-type SnSe through halogens or Ce doping. Importantly, heavily electron doped SnSe single crystals (∼1019 cm−3) can be obtained by Ce-doping through the Bridgeman method. The electrical conductivity of as-grown SnSe crystals evolves from thermally activated behavior to the metallic one when the electron concentrations are increased from 1016 to 1019 cm−3. Remarkably, the power-factor and electronic quality factor of heavily electron Ce-doped SnSe crystals can reach 1.59 and 0.44 μW cm−1 K−2 at 300 K, respectively, which is one of the best thermoelectric n-type SnSe. This work suggests that Ce-doping through the Bridgeman method is an ideal route for further improving the thermoelectric property of n-type SnSe crystals.
通过热锻增强多晶 N 型 Pr 掺杂 SnSe 的热电性能
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直接观察单晶 SnSe 中大量的非化学计量缺陷
DOI: 10.1016/j.nanoen.2017.04.004
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