CuInTe2-xSx(x=0, 0.05, 0.1, 0.15)固溶体的热电性能

doi:10.15541/jim20170051

摘要/Abstract

摘要：

类金刚石结构化合物CuInTe₂作为一种新型的热电材料引起了广泛关注。CuInTe₂在中低温度段热导偏大, 限制了其热电性能的提高。本研究合成了CuInTe_2-_xS_x(x=0, 0.05, 0.1, 0.15)固溶体, XRD和SEM-EDS结果表明所得固溶体均为元素分布均匀的单一物相。同时还发现S和Te元素的固溶有效地引入了点缺陷散射, 降低了晶格热导率。通过Callaway模型模拟实验数据发现应力场涨落引起的声子散射是其晶格热导率降低的主要原因, 但Te位固溶S引起了电输运性能的降低, 若能采用掺杂等方式改善电性能, 则其热电性能有望得到进一步优化。

关键词: 热电, 类金刚石结构, 应力场涨落, 晶格热导

Abstract:

Diamond-like CuInTe₂ compound has attracted great attentions recently as a new thermoelectric material. Despitethe considerable thermoelectric performance, the relatively high thermal conductivity at low and medium temperature ranges restricted further improvement of thermoelectric performance. Alloying was demonstrated an effective way to introduce mass and strain fluctuationsto lower the lattice thermal conductivity in several typical thermoelectric materials. In this work, CuInTe_2-_xS_x (x=0, 0.05, 0.1, 0.15) solid solutions were fabricated by melting and annealing techniques. Phase purity and element distribution were examined by XRD and SEM-EDS measurements respectively. All the samples were pure phase and all the elements were distributed homogeneously. Callaway model was employed to analyze the thermal transport. It isfound that S substitution minimized the lattice thermal conductivity effectively, mainly due to extra phonon scattering induced by strain field fluctuation. However, itselectricalproperties were deteriorated by S doping, probably due to bigger band gap in CuInS₂ than in CuInTe₂.Therefore, if the electrical properties being improved by element doping, the CuInTe_2-_xS_x (x=0, 0.05, 0.1, 0.15) solid solutions will achieve high thermoelectric performance.

Key words: thermoelectric, diamond-like, strain field fluctuation, lattice thermal conductivity

中图分类号:

TQ174

覃玉婷, 仇鹏飞, 史迅, 陈立东. CuInTe_2-_xS_x(x=0, 0.05, 0.1, 0.15)固溶体的热电性能[J]. 无机材料学报, 2017, 32(11): 1171-1176.

QIN Yu-Ting, QIU Peng-Fei, SHI Xun, CHEN Li-Dong. ThermoelectricProperties for CuInTe_2-_xS_x (x = 0, 0.05, 0.1, 0.15) Solid Solution[J]. Journal of Inorganic Materials, 2017, 32(11): 1171-1176.

图/表 7

图1 CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15)化合物的粉末XRD图谱

Fig. 1 Powder XRD patterns of CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) compoundsThe green lines are patterns from the PDF card for CuInTe2

图2 CuInTe1.85S0.15的(a)背散射电子图片, (b)所有元素, (c)Cu, (d)In, (e)Te和(f) S的元素分布

Fig. 2 SEM image of CuInTe1.85S0.15 compounds(a),element mappings of all elements (b), Cu (c), In (d), Te (e)and S (f)

图3 CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15)化合物的(a)赛贝克系数S,(b)电导率σ 以及(c)功率因子PFs 随温度的变化关系

Fig. 3 Temperature dependences of (a) Seebeck coefficient (S), (b) electrical conductivity (σ), and (c) power factors (PFs) for CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) compounds

图4 CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15)化合物的载流子浓度p(a)和载流子迁移率μH (b)随温度的变化关系

Fig. 4 Temperature dependences of hole concentration p (a)and hall mobility μH(b) for CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) compounds

图5 uInTe2-xSx (x = 0, 0.05, 0.1, 0.15)化合物的热导率κL随温度的变化关系(a), 晶格热导率κLP在300K和800K随S含量的变化关系(b)

Fig.5 Temperature dependence of thermal conductivity κ (a)and lattice thermal conductivity κL as a function of S contentat 300Κ and 800Κ (b) for CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) compounds

图6 图6应力场涨落散射因子ΓS和质量场涨落散射因子ΓM随S含量的变化关系

Fig. 6 The strainfield fluctuation scattering parameter ΓSand mass fluctuation scattering parameter ΓM as function of S content

图7 CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15)化合物的zT随温度的变化关系

Fig. 7 Temperature dependence of zT for CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) compounds

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