Different Doping Sites of Ag on Cu2SnSe3 and Their Thermoelectric Property

doi:10.15541/jim20180295

Abstract

Abstract:

Thermoelectric materials enable the direct inter-conversion between electrical energy and thermal energy. However, the conversion efficiency is limited by complex interdependent thermoelectric parameters, while the high performance thermoelectrics should simultaneously possess excellent electrical transport properties and poor thermal conductivities. The diamond-like compound Cu₂SnSe₃ is a promising middle-temperature thermoelectric material. In this work, the phase (Cu₂Sn_0.93Ag_0.07Se₃) with excellent electrical transport properties and the phase (Cu_1.91Ag_0.09SnSe₃) with poor thermal conductivities were obtained just through Ag doping on the Sn and Cu sites, respectively. Meanwhile, their Seebeck coefficients were also quite different. To combine their advantages, the composites of Cu₂Sn_0.93Ag_0.07Se₃ and Cu_1.91Ag_0.09SnSe₃ were fabricated through mechanical mixing and sintering. Benefited from the same crystal structure and the similar lattice parameters for these two phases, the small-mismatch phase interface is supposed to scatter phonons with little influence to the electrons, especially at high temperature. Therefore, the thermoelectric performance is improved due to the synergistically optimized electrical and thermal transport properties, which are well supported by the effective media theory for the composite.

Key words: thermoelectric, effective medium theory, diamond-like, Cu₂SnSe₃

CLC Number:

TQ174

ZHOU Yi-Ming, ZHOU Yu-Ling, PANG Qian-Tao, SHAO Jian-Wei, ZHAO Li-Dong. Different Doping Sites of Ag on Cu₂SnSe₃ and Their Thermoelectric Property[J]. Journal of Inorganic Materials, 2019, 34(3): 301-309.

Figures/Tables 7

Fig. 1 XRD patterns and enlarged XRD patterns between 25° to 45°of Cu2Sn1-xAgxSe3 (x=0-0.09)

Fig. 2 Temperature dependence of thermoelectric properties of Cu2Sn1-xAgxSe3 (x = 0-0.07)(a) Electrical conductivity; (b) Seebeck coefficient; (c) Power factor; (d) Total thermal conductivity; (e) Lattice thermal conductivity; (f) Thermoelectric figure of merit (ZT)

Fig. 3 XRD patterns of Cu2-yAgySnSe3 (y=0-0.09)

Table 1 Lattice parameters and average volume of unit cell of Cu2-yAgySnSe3

y	a/nm	b/nm	c/nm	β/(°)	V/nm³
0	0.69919	1.20763	0.69667	109.26	0.55533
0.01	0.69714	1.20586	0.69671	109.20	0.55310
0.03	0.69812	1.20641	0.69551	109.21	0.55314
0.05	0.69973	1.20578	0.69819	109.47	0.55539
0.07	0.70011	1.20749	0.70033	109.47	0.55817
0.09	0.70019	1.21247	0.69674	109.46	0.55772

Fig. 4 Temperature dependence of thermoelectric properties of Cu2-yAgySnSe3 (y=0-0.09)(a) Electrical conductivity; (b) Seebeck coefficient; (c) Power factor; (d) Total thermal conductivity;(e) Lattice thermal conductivity; (f) Thermoelectric figure of merit (ZT)

Fig. 5 Temperature dependence of thermoelectric properties of composites of Cu2Sn0.93Ag0.07Se3 and Cu1.91Ag0.09SnSe3(a) Electrical conductivity; (b) Seebeck coefficient; (c) Power factor; (d) Total thermal conductivity;(e) Lattice thermal conductivity; (f) Thermoelectric figure of merit (ZT)

Fig. 6 Calculations by effective medium theory for composites of Cu2Sn0.93Ag0.07Se3 and Cu1.91Ag0.09SnSe3

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Different Doping Sites of Ag on Cu₂SnSe₃ and Their Thermoelectric Property

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